This is an animal cell. What is the structure that the arrow is pointing to? A. nucleus

B. cell wall

C. cell membrane

D. mitochondria

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.

This is the interaction of two organisms where one is and the other is neither nor harmed.