00:01
So the question we have is which of the following statements about animal diversity is true? select all that apply group of answers choices.
00:10
So first is the most animal species on the planets are the chordates.
00:17
Well, this statement is false, right? you know, because most animals on the planet are invertebrates that are insects.
00:26
So 97 % of all the animals are, are invertebrates, most of which are insects, more than 1 million of insects have been studied.
00:37
Second is that the first animals to move on to land were the tunicates.
00:42
Well, the statement here is false.
00:47
Well, because ancestors of amphibians were the first vertebrates to move on to land, a very first animal to move on to land are invertebrates, mostly that are arthropods, right? so the third is, are flatworms, the first opening to form during early development becomes the mouth.
01:08
The statement over here is true.
01:11
For flatworm, the first opening to form during early development becomes the mouth.
01:17
The flatworm has a gastro -vascular cavity that serves as both mouth and anus.
01:24
So the digestive tract has only one opening, right? so only arthropodes have an exoskeleton that must be shed in order to grow.
01:34
The statement here is true...