Answer:
The circulatory system has evolved over time from simple diffusion through cells, in the early evolution of animals, to a complex network of blood vessels that reach all parts of the human body. Made of specialized and unique cardiac muscle, it pumps blood throughout the body and to the heart itself.
Claps shut at birth. Evolutionary changes in the vertebrate heart are tied to change from single to double-circuit heart, with increased separation of oxygenated and deoxygenated blood, allowing more efficient respiration and circulation to fuel high activity and increased oxygen demands associated with endothermy.
Answer:
e) Lamarck
Explanation:
Lamarck stated that traits could be acquired due to the use or disuse of a certain structure, for example: if giraffes were trying to reach leaves this would cause their necks to elongate and the trait would pass onto the next generation in other words organisms could change by what organisms want or need. In the 1880s, the German biologist August Weismann disproved this theory.
C. Bacteria do not have a nucleus and instead have strands of DNA that are loose in the cell
To keep the body's internal environment in balance c) to make room for nutrients coming in d) to reduce unpleasant
The retinas of night hunting animals have more rod cells which enable them to see better with minimum light.
