which is a predator/prey relationship found in a freshwater ecosystem?

a. heron/fish

b. shark/crab

c. tiger/gazelle

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

How does an angiosperm prevent self pollination

Aquaternary consumer species would be expected to have a smaller population than a secondary consumer species. select the best answer from the choices provided t f