What is a trait that is ancestral to all chordates?
a. a jaw bone
b. a notochord
c. an amniotic egg
d. a vertebral column

What gases are carried by the blood

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?

Match each type of short-term climate change with its definition