Aphotosystem is:
a: a collection of hydrogen-pumping proteins
b: a collection of photosynthentic pigments arranged in a thylakoid membrane
c: a collection of photosynthetic protons arranged in a thylakoid membrane
d: found only in prokaryotic organisms

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

How does human environment effect the biosphere

Which of the following is not a potential result of deforestation?