This semiarid region has enough rainfall to allow short grasses and low bushes to grow.
a.) arctic
b.) steppe
c.) desert
d.) tropical rain forest

Which of the following systems in absorbing oxygen and releases carbon dioxide

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.