D. It would be 30 C cooler, makes the most sense because greenhouse gasses cause warmth and without them it would get colder.
B. Animal cell, I believe so because of the shape of the cell and it does not clarify if it has a cell wall, if it has a cell wall and mehran then it's a plant cell if it only has a cell membrane in them it's an animal cell
The answer is: " a gradient " .
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Hope this helps!
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Answer:
see below
Explanation:
bacteria are actual living creatures. most bacteria are actually harmless. Without bacteria, you wouldn't be able to digest food or fight diseases
viruses aren't living things; they're literally just protein and DNA packed together into a shape. Viruses are extremely specific about the cells they attack, while bacteria infections could be anywhere in the body. Viruses cannot be killed by antibiotics, while bacterial infections can be killed by antibiotics (life lesson: don't take antibiotics if you have a common cold)
sorry for the late answer but here you go:
"This was triggered by cyanobacteria producing the oxygen which developed into multicellular forms as early as 2.3 billion years ago. As evolutionary biologists have shown, this multicellularity was linked to the rise in oxygen and thus played a significant role for life on Earth as it is today."