If you follow the shortest food chain in the food web below from aspen to
owl, how many trophic levels are there?
grass
aspen
grasshopper
rabbit-
fox
frog
snake
owl
A. Three
B. One
C. Four
D. Two

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

What substance acts to prevent sudden ph changes in bodily fluids?

Why are common names a problem for scientist?