Explain why a mark on a blade of grass will move away from the ground as the grass blade grows, but a similar mark on a tree trunk will not move away from the ground.

Which term describes a normal value for something in the body? a. homeostasis b. set point c. feedback loop d. integration center

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

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution