Animals that eat only plant material

Filter feeders...

Complex organisms have digestive systems that consist of

Because cells tend to use oxygen in cellular respiration, oxygen diffuses ___ cells.

Saclike structures that are made up of a thin layer of cells where gases are exchanged between air and blood

All animals that live in water have gills.

Which is NOT a way that animals on land get oxygen?

All vertebrates have a ___ circulatory system in which blood always stays in the vessels and heart.

In sexual reproduction,

A disadvantage of asexual reproduction is that

A sponge

Some animals that use internal fertilization

In animals that retain their eggs,

Which is true about placental mammals?

Which is NOT a stage in complete metamorphosis?

A frog larva is called a

Which is true about birds?

Which of the following organisms lays amniotic eggs?

The process in which an animal's cells use oxygen and digested food molecules to release energy in food is

If an animal has only flat teeth, it probably eats

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