3. how often does the sun's magnetic field reverse?
a. every 11 years
b. every two million years
c. every 100,000 years
d. every 350 days

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?

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.