From what I remember it's called a substrate
It would be Isomers!!!!! Hoped this helped you out.
Answer:
n stage 13, all four limb buds are present. In stage 13, the upper limb buds resemble flippers. In stage 23, the upper limb shows well-formed arm, elbow, wrist, and fingers. In stage 23, the lower limb shows well-formed toes, feet, and knees.
Explanation:
They're called anastomoses
Modern humans have been the only species of homo, so true .
