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Hi there.
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Today's question is dealing with radial symmetry.
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Specifically, if an animal has radial symmetry like a hydra, what is it likely to have? so let's write down our options and figure it up from there.
01:02
So we have a forebrain, nerve net, cerebral ganglia, ventral, nerve cord, and then b and c, and c, c, cerebral ganglia, and a nervefant.
01:33
Okay, so let's figure out what the heck a hydra is.
01:39
So think about your understanding of the animal kingdom and what a hydra may be.
01:59
So a hydra kind of looks like, it's got like a too -to -do.
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Meaning that they look the same from the left and the right, but they are not the same when it comes to the up and the down.
02:45
So radial symmetry parts radiate from a central point.
03:19
Okay, so it's asking us, for a radially symmetrical animal like this hydra, what is it unlikely to have? or what is it likely to have.
03:28
So, let's get into this.
03:33
So what is a forebrain? a forebrain is something that is very complicated that we have.
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And an animal that is not advanced, like those that have radial symmetry usually, you can pretty much figure out that they're not going to have a forebrain because that's pretty far out.
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So a nerve net, hmm, okay.
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So a nerve net is an option, so we're going to skip ahead for a second there.
04:21
Next up, we have cerebral ganglia...