This biotic factor in the photograph characterizes which biome?
a) boreal forest
b) tropical savanna
c) tropical rainforest
d) temperate deciduous forest

The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Explain why phospholipid molecules form a bilayer. (3 marks)