The structure of the cell membrane allows it to be selectively permeable. what is the name for the larger, brown structure in the diagram?

a) lipid bilayer
b) protein channel
c) hydrophilic heads
eliminate
d) hydrophobic tails

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Which of the following best describes the relationship between glucose and complex molecules such as hormones?