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:
It makes the dogs at a higher risk of health issues later on in life.
Explanation:
The dogs are usually only bred for looks. Their health is not taken into consideration.
The correct answer would be wind, coriolis effect and land. Hope this helps! :)
Answer:
abiotic constituents, minerals, climate, soil, water, sunlight, and all other nonliving elements, and its biotic constituents,
Explanation:
