Answer:
endosymbiosis.
Explanation:
By the beginning of the 20th century, researchers thought that plastids and mitochondria could come from bacteria. These would have been ingested by primitive cells and live within them in symbiosis.
There are really two main differences with plants and animals. All plants will contain an enormous Vacuole, Cell Wall, and numerous Chloroplasts. All of which will never exist in an animal cell. While animal cells contain moderate Vacuoles. They simply lack the other components mandatory in Plant Cells.
Answer:B. The variety of species in an ecosystem
Explanation:
Homeostasis is the maintenance of internal conditions within a body. Examples of homeostasis in human includes the regulation of blood glucose level, the regulation of body temperature, or the regulation of water volume inside body.
For maintaining blood glucose concentration, the pancreas releases hormones to help the blood glucose level go back to normal. For example, if the blood glucose level is too high, insulin will be released and some glucose can be converted into glycogen and store in liver. On the other hand, if the blood glucose level is too low, glucagon is released and glycogen is converted back into glucose.
For body temperature, if the temperature is too low, our hair stands upright so more heat is trapped. In addition, our arterioles under skin contracts too so less heat is lost to the surroundings. On the other hand, if our body temperature is too high, our hair stays flat so heat can be transported away quickly, and our arterioles dilate, so more blood flows to the skin surface and more heat will be lost.
Last but not least, if the water volume in body is too low, antidiuretic hormone is released and more water is absorbed by the kidney so less water is lost. On the other hand, if the water volume is too high, antidiuretic hormone is inhibited so less water is reabsorbed back into the kidney.
