What type of commensal relationship is orchids growing on branches of trees ?

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

Which locations on the map are low-pressure areas? a b c d e

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems