How many trophic levels are there in the following food web? spider
robin
fly
worm
grass
A. 5
B. 3
C. 4
D. 2

Dominant over the mutant vermilion (bright red) allele. a homozygous wild-type female fly is mated with a vermilion male fly. predict the eye colors of f1 and f2 generations. (assume that the f1 flies are allowed to interbreed to produce the f2 generation.)

The zone, which exists from a depth of 0 to 600 feet, is home to the majority of ocean life.

15 ! come and answer! a(n) disease is caused by a pathogen and can spread among organisms. a infectious b noninfectious c toxic d contaminated