8. A student is looking at a cell under a microscope. Which organelle tells the student that she is looking at a plant cell and not an animal cell? (5712a) 1 pt.
A Nucleus
B. Chloroplast
C. Endoplasmic reticulum
D. Cell membrane

What are the similarities of physical and chemical change ?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules