2. which of these has the least affect on the composition of our atmosphere? a      human activityb      biological activityc      geologic activityd      tidal activity

Describe the function of the endomembrane system? what organelles are involved?

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?

The variation among individuals, on which natural selection acts