B Nature selection for traits the allow for increased rates of reproduction and survival over traits that don't, is correct.
A is also correct
He studies geosphere and biosphere.
Answer:
Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes
Explanation:
Answer:
All of the above
Explanation:
The definition of ecosystem is "a biological community of interacting organisms and their physical environment." and all four of the answers fit the bill.
