Which trait is most likely to be acted on by natural selection?

A.

the knowledge that a person learns in school

B

the tricks a dog knows how to perform

C

the length of bird's beak

D

the size of a weightlifter's arm muscles

As exercise levels increase, which of the following physiological changes occurs in the respiratory system?

Which type of cell is necessary for an immune response?

Why are human males much more likely than human females to inherit the recessive condition hemophilia (a failure of the blood to clot properly) ?

Can a cell make a protein directly from a gene?

Is the current rate of species loss 10 times the typical rate of extinction?

A specialized unit within a cell that has a specific function

What kind of relationship is it between particle size and permeability? Direct or indirect

The evolutionary perspective on mate selection claims that males and females differ in preferences of mate selection primarily due to the A hormone compositions of each gender B. societal expectations and restrictions of each gender C.

What is one difference between a cell wall and a cell membrane? 1) Cell walls have gap junctions. Cell membranes have plasmodesmata. 2) Cell walls act as a boundary that nothing can pass through. Cell membranes allow materials in and out of the cell.

Plants have (blank) cells that contain the DNA that decides how they take shape and function Options Elongated Meristem Parenchyma