Why does iron fertilization of open oceans increase phytoplankton densities?
a) the growth of phytoplankton is often limited by iron availability in the open oceans.
b) iron is a growth stimulant.
c) researchers are still uncertain about why iron fertilization increases protist densities in the open ocean.
d) iron is a toxin that kills the zooplankton that feed on phytoplankton.

Asap! how does the distance between two objects affect the force of gravity? how is the moon dependent on the sun?

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

Pls quickly! which of the following is true about the behavior of an organism? a. the behavior of an organism is influenced by both its heredity and it’s environment. b. the behavior of an organism is influenced only by the treats it inherits from its parents. c. the behavior of an organism is influenced only by the environment in which it lives in. d. the behavior of an organism is not influenced by either it’s heredity or its environment.