A sea star is an invertebrate.

In arthropods, molting is necessary because _____.

Which type of muscle is voluntary?

Plants with wide leaves have more surface area for photosynthesis.

The integration and command center of the body is the _____.

Plants with wide leaves have more surface area for photosynthesis.

Food chains interconnect forming _____.

Food chains interconnect forming _____.

Which of the following trophic levels would have the lowest population size?

Which of the following trophic levels would have the lowest population size?