What are shared characteristics of all vertebrates?

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

Sperm pass through the and connect to a short ejaculatory duct. vas deferens prostrates seminiferous tubules none of the above

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the