Anaerobic photoautotrophs were the first organisms to release oxygen into the early atmosphere.
a. true
b. false

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.