The front leg of an iguana and the wing of a bird look different, but both limbs likely originated from a similar limb in a shared ancestor. structures such as these are said to be
a)heterogeneous
b)differentiated
c)vestigial
d)homologous

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Why would a drug that damages capsids treat a viral infection? a. capsids prevent the lytic cycle from beginning. b. transduction requires a capsid. c. viruses use capsids to increase genetic variation. d. capsids provide protection for viruses.

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area