Which type of organism moves by peristaltic muscle contraction, extending its body in one direction, then shortening and pulling itself along a surface?a. antsb. li...

Which type of organism moves by peristaltic muscle contraction, extending its body in one direction, then shortening and pulling itself along a surface?
a. ants
b. lizards
c. sea stars
d. sponges

All right, everybody, this is Ricky. And today I'm gonna watch you through. Problem number two from Shepard 39. Which type of animal hasn't accepts delicate skeletons. So going through the answer choices, we have to really think back on par. Evolutionary physiology here. So arthropods, spiders. Uh, for example, have exoskeletons made from chili slid arians. You see, like flatworms, earthworms and primates. No exo skeleton. All right, so absolutely, it was helpful. And I will see you on the next one.

To answer this question, we first have to identify what the measured ERM is and then identify which, uh, animal will not have, uh, any tissue derived from messenger. So, based on our answer choices, we have to choose the correct answer choice that will not have any tissues derived from the messenger. So let's begin. What is the method? Um, well, the Meso Durham is a layer, and it's a layer in animal embryos that will develop into specialized tissues and all these layers in the animal tissues. Uh, animal embryos are known as German layers, so it is a germ layer Tom that will develop into specialized tissues now in animal on human cells. What kinds of tissues would these be? Well, it turns out that these are tissues such as skeletal muscles, smooth muscle blood vessels, bone cartilage joints, connective tissue under Queensland's kidney, cortex, heart muscle, euro genital organs, the uterus, fallopian tubes, testicles, blood cells, lymphatic tissue. So we're seeing a lot of different tissue types, but these air very specialized tissues. That's an important point now. Also, we should note that the Meso Durham meso meeting middle Okay, so meso meaning middle is going to be located in between the ectodermal and endowed ERM off the embryo. And then finally, we just have to identify which of the animal groups will not have any of this Meso Durham derived tissue. And looking at our answer choices, we just simply have to note that it's the flatworms that will have no tissue derived from Macedon. And this is a simple memorization question, and we have to identify that it is flatworms that are the correct answer. They do not have any tissue drive from measured or so that means that our answer is answer choice d.

Question number six from Chapter 18 asks which of the following animal groups does not have tissue derived from use it, er, the best late Teoh. The best thing to remember in order to answer this question well, is that Mr Term is the cell layer that has developed latest evolutionarily before you would have the music term, the organism would actually only have two layers of cells. If we can remember which file A consists of members that only have two layers of cells, and this is a pretty easy question to answer. So just review. Analysts are roundworms, and they definitely have three cell layers. They actually have the first true Selim that we see in nature. He kinda terms are organisms like starfish. Starfish have pretty complex digestive system and things like that. So we can confidently say that they are derived from three cell layers. Nigerians or jellyfish actually do only consist of two layers, but I always like to check the last question or the last time option, and last option is flat. Worms. Flatworms include organisms like plain area

This question asks, What does the paramecium is? Contract town of actual help. Regulate, regulate inside the cell. Our aunts choices are amount of food, amount of water, movement and reproduction. So the contract I'll vacuole will maintain home your Stasis within the paramecium. And what kind of home you'll states are we referring to? Well, we will illustrate that right here. So we have a pyramid siem, and there will be contract on vacuole inside. Now the outside or exterior solution where that para missing will be located is a hypo tonic solution. And now, if we were to look at the inside of the paramecium, we find that it is a hyper tonic solution, and what this means is that the exterior is going to have a low Salyut concentration, whereas the interior was going to have a high solid concentration. And, as we know, water moves by osmosis from a low salad concentration to a high side concentration. However, the contract high vacuum would be able to collect all the water more extra water from the cytoplasm, and it will pump it out and expel it into the extra Seiler environment. So in doing so, it maintains a water balance. So the home Leo Stasis were referring to here is a water balance. So looking back at our choices, we know that Choice B is the correct answer because the contract of actual regulates the amount of water inside the cell.