Answer:
Four innovations are central nervous system, eyes, bilateral and hermaphrodites.
Explanation:
Innovations found in an ancient flatworm were the presence of central nervous system means head and a brain. The head had eyes which is the first in the animal world. Their body is bilateral means equally divided into two parts. They are also hermaphrodites means having male and female on a single organism which was not present at that time of animals.
When the egg cell is fertilized with the sperm cell, it changes into a zygote. It then becomes a morula and blastula. Then it turns into grastula and neurula where neural plate is transformed into neural tube.. Finally, it becomes a human embryo.
Cytokinesis is necessary at last to complete both the cell division !
<span>a chemical substance produced and released into the environment by an animal, especially a mammal or an insect, affecting the behavior or physiology of others of its species.</span>
Answer:
protein and energy
Explanation:
if you look close at the wall of a plant it has cellulose and hemicellulose.
