Which of the following molecules would need assistance to pass through the plasma membrane?
[mark all correct answers]

a.
alcohol

b.
amino acids

c.
glucose

d.
carbon dioxide

e.
steroids

f.
sodium ion

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases

What is the difference between topsoil and clay?