On an island chain in the pacific ocean, you come across a numberof
species of hummingbirds. the species are all similar enough
thatthey probably all share a common ancestor, yet different enough
tobe classified as separate species. how does the theory of
evolutionby natural selection explain how these hummingbird
speciesarose?

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?