What molecule is used by animals as a way to store carbohydrates?

Select the pairs of organism characteristics that are homologous structures. 

A bird’s wing and the wing of an insect are examples of which of the following?

The forelimb of a whale and the wing of a bat and both used for locomotion, but in very different ways. However, when the bone structure of these limbs is examined, they are found to be very similar. This indicates that these two different species are

Consider the following demand and supply schedule.  Calculate the price elasticity of supply (PES) if the price rises from $200 to $300. 

When demand is elastic, price and total revenue move in the same direction. 

Two goods are complements to each other if an increase in the price of one of the goods 

Which one of the following does not determine how elastic demand for a good is? 

The demand curve slopes downward because of the income and substitution effects. 

Which of the following are determinants of demand? Select all that apply.