Vertebrata
Vertebrata is a group that contains various organisms which possess vertebrae (backbones). Animals that belong to the group are called vertebrates, and they include mammals, birds, fish, amphibians, and reptiles. The backbones in the animals extends from the head to the tail, and it encloses and protects the main nerve cord. The body of vertebrates is divided into trunk, and tail regions. They also possess a unique tube shaped brain, a distinct head, and three pairs of sense organs.
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The revision likely helped producers in the United States, because they no longer had to comply with the expensive regulation.
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here.
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Homeostasis is keeping internal body conditions near constant.
Now let's apply this to cleaning our room:
for example, if it's a mess, no one will really tolerate inhabiting it. Same with our body. For our bodies to function, everything needs to be ordered, all the chemical reactions need to happen at a certain rate at a certain time.
Let's for example talk about your room's temperature, if it gets too hot, you're going to switch on the fan and if it gets too cold, you'll hide under a blanket. And you will do this so that you're comfortable enough to carry on with what you do.
Same for our body, if it gets too hot, your body, via negative feedback, will be able to lower it's temperature such that the chemical reactions, keeping you alive, occur at an appropriate rate without enzyme denaturation.
Cleaning up your room from all the dirt is like excreting all the waste products that gives your body a healthy balance. Eg: the carbon dioxide you excrete when you breathe out is important because if it remains in your blood, the blood's ph will drop, which'll affect the rate of chemical reactions. Similarly if the dirt in your room accumulates it's going to smell bad.
The answer is (A) Mitochondria have their own DNA molecules, separate from the rest of the cell's DNA.
The endosymbiotic hypothesis concerns with the presence of two special organelles, mitochondria and chloroplast within the eukaryotic cell. These two organelles have their own set of DNA that is different from the nuclear DNA of the eukaryotic cell. It is believed that a primordial eukaryotic cell was in a symbiotic relationship with mitochondria-like bacterium. The primordial cell eventually engulfed the mitochondria-like bacterium for ATP production to power itself.
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Hope this helps!
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"When your body is injured in some way or something else is wrong, your nerves (cells that help your body send and receive information) send millions of messages to your brain about what's going on. Your brain then makes you feel pain." -Why Do I Have Pain? (for Kids) - Nemours KidsHealth
I didn't write that, but I gave credit to whoever did.