Ms. Smith told her students to do 30 jumping jacks without stopping. When everyone had completed the jumping jacks, she asked the students to look around and observe each other. She said, "What do you notice about each other that is different from before you did the jumping jacks?" The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.
A) limit
B) response
C) stimulus
D) feedback mechanism

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

What is the best conclusion based on this data? the hypothesis was not supported because the data indicated that fertilizing plants does not improve plant growth. the hypothesis was supported; to get the best growth, use 5 milliliters of fertilizer per plant. the hypothesis was not supported; the data indicated that too much fertilizer can inhibit plant growth. the hypothesis was supported; to get the best growth, use 15 milliliters of fertilizer per plant.

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?