Explain the effects of a marine parasite that kills all phytoplankton

Why is excretion necessary to maintain homeostasis?

How can you tell the difference between rough er from smooth er?

Cathy hypothesized that corn would not grow in mud. to test this hypothesis, she took corn kernels and placed 5 in mud, 3 in soil, and 2 in water. to her surprise, the kernels in the mud grew faster than the kernels in the soil. what error might have caused these unexpected results? a. wrong hypothesis b. not enough variables c. undefined control d. too many variables