Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
The F1 generation will appear to be only Bt
Answer:
eukaryotes
Explanation:
Acheas and Eucariontes have a common ancestor, which justifies the vast similarity in the structure and cellular function of each individual. These similarities have already caused confusion in the academic community that has already joined the two organizations in a single group, however, it is now known that the similarities are due to a common ancestor.
