Which is true for urochordates?

the notochord is present throughout their lives.

the notochord is present only in the larval stage; it is absent in adults.

the notochord is present in the larval stage; it becomes vertebrae in adults.

Afor ram b for pats super bowl pick one

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature about 37 degrees celsius (98.6 degrees f)? describe what might happened the temperature decreased by 10 degrees celsius.

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent