Background extinction refers to the normal extinction rate. These are species that go extinct simply because not all life can be sustained on Earth and some species simply cannot survive. Mass extinction is a widespread event that wipes out the majority (over 50%) of living plants and animals.
Answer:
What?
Explanation:
I don't understand the question.
Which structure are you talking about??
The answer would be c. only plant cells and some single cell organisms photosynthesize.
Since this is college level biology, you should know that red blood cells do not contain organelles... therefore it does not do a,c, and d. So, the question should say, which of the following is correct.
Answer:
Option A. Steak, is the correct answer.
Explanation:
Steak is the food substance that contains the material which is needed to build muscles in the human body , but does not contain the macromolecules that provides quick energy. Steak is a type of meat which is a good source of protein and protein is the main nutrient which is responsible for the building of muscles in the human body.
Question 4. Populations, communities. Question 5: Biotic factos
