Hi! This lesson is really interesting and is it possible for me to ask a few questions? -I was wondering, how does these lancelets eat and what do they eat? are they classified as omnivores, herbivores, or both? -Do lancelets possess scales? At a glance, they look like they have a really smooth skin! -Are they classified to be symmetrical bilaterally? -Lastly, if ever they don't have scales, do they process slimy skin? I hope you can answer my queries as you video presentation really helped me with my studies! Thank you
Hi! They are already in the description! If you scroll to the bottom of the description, under where it says the channel name, it has a shortcut and preview of all RUclips videos linked in the video you watched.
@ProfessorNewtoff oh, I see now, thx. I watched your videos for the exam and I can say that your videos allowed me to understand each taxon and phyla easily.
It's the other way around, plant cells have a cell wall, but not animal cells. The cell wall is a way to provide structure to plants (making them upright). However, animals have various proteins, tissues (such as cartilage and bones), chitin, and more than also provide that structure, so it's not necessary for animal cells to have a cell wall. Also, animals move, and a cell wall would make it too rigid to do so.
So the notocord is the precursor of the vertebral column (your backbone). Think of it as structural support. However, the nerve cord is your spinal cord. This is the message relay center, sending signals throughout your body.
@@ProfToff I know but, aren’t phylum’s like echinoderms and hemichordates are either younger or roughly about the same age as chordates? In the evolutionary tree of Deuterostomes, chordates diverged from the common ancestor that gave rise to both Echinoderms and hemichordates making their lineage slightly older. But, in other evolutionary trees about Deuterostomes that includes the extinct phylum known as Vetulicolia, it is grouped as closely related to chordates by showing how both phylum’s diverged from each other from the same common ancestor, thus showing that the common ancestor of chordates and vetulicolians and the common ancestor of echinoderms and hemichordates both evolved from the same common ancestor making either echinoderms chordates appearing at the same time.
@@SooJeon-rt7nq Ah okay, I see what you are getting at now. And very true -- nearly all of the animal phyla evolved during the Cambrian Explosion. You are correct that some things are probably more concurrent versus one after the other. Traditional textbooks list the phyla in the order they are in my channel (at least, in the animal diversity playlist). Because of how long ago it was + the lack of awesome evidence (fossils are great, when fossils are made...), we won't be able to pinpoint exactly when we see emergence. And then you have to consider at what point is the common ancestor to the echinoderms and chordates 'considered' one of those groups versus the predecessor, etc. With the videos on the phyla, I don't really focus or go into depth about timelines because for my classes, what I want them to know is the major characteristics of the groups. Sorry I don't go as in depth here!
It's not necessarily a cause and effect in that way, it's more of "there is a diversity of organisms, therefore there is a diversity of DNA (which also means a diversity in genes)". There is a diversity of organisms because there is a diversity in environments and organisms will adapt to those independent niches.
Thank you so much for this video! It really helped me understand better and I'm so glad I came across this video!
Carry on making videos they are much helpful to me and you are very good
Well explained! Great job!
Thank you so much for the video❤❤
Hi! This lesson is really interesting and is it possible for me to ask a few questions?
-I was wondering, how does these lancelets eat and what do they eat? are they classified as omnivores, herbivores, or both?
-Do lancelets possess scales? At a glance, they look like they have a really smooth skin!
-Are they classified to be symmetrical bilaterally?
-Lastly, if ever they don't have scales, do they process slimy skin?
I hope you can answer my queries as you video presentation really helped me with my studies! Thank you
Thank you really helpful for studying for the science bee I got today
It would be much easier to us if you put the links in the description of the video.
Hi! They are already in the description! If you scroll to the bottom of the description, under where it says the channel name, it has a shortcut and preview of all RUclips videos linked in the video you watched.
@ProfessorNewtoff oh, I see now, thx. I watched your videos for the exam and I can say that your videos allowed me to understand each taxon and phyla easily.
Is there a reason why animal cells have a cell wall but plants don't? What do you think?
It's the other way around, plant cells have a cell wall, but not animal cells. The cell wall is a way to provide structure to plants (making them upright). However, animals have various proteins, tissues (such as cartilage and bones), chitin, and more than also provide that structure, so it's not necessary for animal cells to have a cell wall. Also, animals move, and a cell wall would make it too rigid to do so.
Thank you. For you explainig . I uderstand well
What is the difference between notochord and nerve cord in humans to be specific?
So the notocord is the precursor of the vertebral column (your backbone). Think of it as structural support. However, the nerve cord is your spinal cord. This is the message relay center, sending signals throughout your body.
Chordates aren’t the most recent phylum of animals. Infact, they’re actually quite primitive with ancestors spanning before the Cambrian explosion.
Do you know of a more recent phylum...? Just because they are the most recent, doesn't mean that it still wasn't millions of years ago...
@@ProfToff I know but, aren’t phylum’s like echinoderms and hemichordates are either younger or roughly about the same age as chordates? In the evolutionary tree of Deuterostomes, chordates diverged from the common ancestor that gave rise to both Echinoderms and hemichordates making their lineage slightly older. But, in other evolutionary trees about Deuterostomes that includes the extinct phylum known as Vetulicolia, it is grouped as closely related to chordates by showing how both phylum’s diverged from each other from the same common ancestor, thus showing that the common ancestor of chordates and vetulicolians and the common ancestor of echinoderms and hemichordates both evolved from the same common ancestor making either echinoderms chordates appearing at the same time.
@@SooJeon-rt7nq Ah okay, I see what you are getting at now. And very true -- nearly all of the animal phyla evolved during the Cambrian Explosion. You are correct that some things are probably more concurrent versus one after the other. Traditional textbooks list the phyla in the order they are in my channel (at least, in the animal diversity playlist). Because of how long ago it was + the lack of awesome evidence (fossils are great, when fossils are made...), we won't be able to pinpoint exactly when we see emergence. And then you have to consider at what point is the common ancestor to the echinoderms and chordates 'considered' one of those groups versus the predecessor, etc. With the videos on the phyla, I don't really focus or go into depth about timelines because for my classes, what I want them to know is the major characteristics of the groups. Sorry I don't go as in depth here!
Thank you so much
Thank you for this video ! it was extremely informative and helped me sooooo much with my geology assignment 😊
hi mom! 🤗
Thank you professor, it is brief, clear and informative
There are some pretty big cephalopods out there
Man, imagine 100,000 years ago! Out current cephalopods have nothing on today's ones!
Is the diversity of animals and other organisms due to DNA (Nucleic acid) and the diversity of genes?
It's not necessarily a cause and effect in that way, it's more of "there is a diversity of organisms, therefore there is a diversity of DNA (which also means a diversity in genes)". There is a diversity of organisms because there is a diversity in environments and organisms will adapt to those independent niches.
Thank you ma
THANK YOUUUUUUU
don't seach up humans with tails
You searched up humans with tails didn't you?