Distinguish between a variable and a control

Which of the following is considered the simplest animal?

This is a mechanism by which organisms maintain homeostasis when the level of one substance influences the level of another substance or the activity of an organ.

You are getting ready to leave the lab. You lift your pencil to put it in your book bag. Then you lift your lab book and place it in your book bag. Which scenario resulted from the stimulation of more motor units?

Explain why blood group A cannot be transfused to blood group B

Which graph should be used to represent the percent composition of the human body

How does the Sun contribute to physical weathering? A. When water is heated, it expands, which causes rocks to break. B. Minerals in rocks heat and expand at different rates, which causes rocks to break. C.

A phylogenetic tree shows that birds and crocodiles share many features. A hypothesis based on this tree predicts that these features are present in a common ancestor. Which of these predicted traits is supported by fossil evidence?

Imagine that you are talking with one of your friends about your biology course. He states that the somatic nervous system is subdivided into sympathetic and parasympathetic components, and is responsible for involuntary responses.

In both American cotton (Gossypium hirsutum) and Egyptian cotton (G. barbadense) petal spot is a dominant character over no petal spot.

How is it possible for percolating groundwater to remove mineral material as well as deposit it?