This is any chemical substance that an organism requires to live and grow. Example: carbohydrates

Why is it important for the appendages of an arthropod to be jointed? The joints store water and prevent the animal from drying out. The joints make the appendages flexible and allow for movement.

Why does a bacterial cell not contain mitochondria

How does the development of the cell theory serve as an example for the development of scientific theories in general?

Which animal kingdom does the organism that causes plague belong to?

The number of cytosine in a DNA molecule equals the number of guanine. adenine. thymine. all of the above

Which of the following types of compounds is unlike the other three A - Wax B - Saturated fat C - phospholipid D-polysaccharide

What predictions can researchers make based on the egg viability hypothesis?

What occurs after a disturbance in primary succession?

A person driving a car applies the brakes. This produces friction, which stops the car. Into which type of energy is the mechanical energy of the car converted

Why do our classification systems change?