During a "leap year" we add an extra day to our calendar because:

A. The Earth takes 24 hours to rotate

B. The moon takes 27.3 days to orbit

C. Earth takes 365.5 days to revolve

D. The moon takes 29.5 days to orbit

Why do we use a dichotomous key and how does it work?

Which of these is an example of transpiration? A. snow falling on the slopes of Mt. Everest B. steam rising from Lake Michigan in the morning C. trees in the Canadian forest releasing water vapor D.

What is the difference between mitosis and meiosis? A. Meiosis happens more quickly than mitosis. B. Meiosis includes one cycle, and mitosis includes two cycles. C. Meiosis is required for the survival of an organism and mitosis is not. D.

An organism that lacks neurons that perform integration A) can be expected to lack myelinated neurons. B) will not have a nervous system. C) will not be able to interpret stimuli. D) cannot receive stimuli.

How are other types of rocks changed into igneous rocks?

What is the significance of meiosis with respect to sexual reproduction?

How did Darwin's understanding of heritability weaken his arguments?

Which statement best describes the overall change that occurs as a result of mitosis?

When people plant vegetation they what? erosion

What is a polypeptide?