What term describes the smallest unit that can perform all of the functions necessary for life?
A. a single cell
B. a cell nucleus
C. a cell membrane
D. a multicellular organism
I will mark BRAINLIEST 24 pt.

What is thought to have caused the mass extinction at the end of the cretaceous period?

What element is able to combine with itself and hydrogen to form large molecules ?

Which of the following words best matches this definition: the process in which the best adapted organisms survive and pass on their traits, while those that are not well adapted do not survive to pass on their traits. question 3 options: acquired selection natural selection artificial selection organic selection