Which of the following statements is true?

a) since all cells carry out cellular respiration, they contain mitochondria.

b) a cell cannot be subdivided into smaller units that maintain the living state.

c) plant cells contain chloroplasts and no mitochondria while animal cells contain mitochondria and no chloroplasts.

d) the cell membrane's function is to prevent diffusion of any substances into or out of the cell.

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

What is a dendrite and what does it do?