Question 3
Which substances may pass through a cell membrane by
simple diffusion?
carbon dioxide and starch
starch and protein
carbon dioxide and water
protein and fat
Na

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

9. the history of life on earth is recorded in

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers