Consider the model of natural selection. in order for the end result to be dark gray circles, what do you know about the population? a) some members are more fit. b) heritable traits favor survival. c) the environment should not change over time. d) all members must engage in sexual reproduction.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

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?