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.
Answer:
They are the species which are found only in a particular area. They can be a plant, animal or microorganism. They are at great danger of becoming extinct due to the following reasons: - As they are restricted to a particular area so loss of their habitat is the major reason which could lead to extinction.
Explanation:
Answer:
Both processes involve carbon compounds either taken in from the environment or produced by the organisms themselves
Explanation:
Most scientists don't used the word law because that implies it is infallible but generally scientific laws and theories are used interchangeably so true.
Like transpiration in plants mammal's hypothalamus makes sweat glands functional and mammal's body secretes sweat which on evaporation decreases the body temperature
