write a 2-3 sentences on What causes change to ecosystems and when changes to the living or nonliving things occur, what is the impact on the populations of that ecosystem?

Explain why scientists use shared characteristics to make cladograms.

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?