The blood carries waste gases from the body to the lungs to exchange for oxygen.

What is one distinguishing characteristic of eukaryotic cells?

What does k-selection refer to? a. species that produce relatively few offspring but invest a large amount of parental care b. species that become extinct after a few generations c. only egg-laying species d. all species except primates?

Do all animals share a common ancestor?

What does a cladogram show about organisms?

The variation of organisms within an ecosystem is characteristic of which type of diversity

The study of all ecosystems on Earth is called

the sun's gravity also affects tides on earth. why does the moon have a larger effect on tides than the sun does

14. Why are carbohydrates and fats considered high energy foods? A. They have a lot of oxygen atoms B. They have no nitrogen in their makeup C. They have very long carbon skeletons D. They have a lot of electrons associated with hydrogen E.

Of the following lines of flowering plants, which represents the line of evolution that is most closely related to other plant ancestors? Basal Angiosperms

What need to be recognized by the t cells on the antigen presenting cells before becoming fully activated?