Answer:
A.
Explanation:
Human heart is an organ that is responsible for the circulation of blood throughout the body and works in a systematic pathway.
The human heart recieves blood from two large veins, the superior and inferior venae cavae and enters through different chambers in the heart that is first at right atrium to right ventricle, from right ventricle to left atrium, then from left atrium pumped into the left ventricle.
The blood first enters into arteries and than move to narrorwer to arterioles that deliver blood to capillaries of the organ where the oxygen and nutrients from blood are supplied to body cells for metabolism and the deoxygenated blood enters into veins.
Hence, the correct option is "A".
Producers are dependent on consumers because without the consumers no one would buy the producers product. since no one would be buying the producers product they would have no business. they depend on our money and for us to consume these products
There is obviously not a definite number because there are so many kinds of insects that we are not familiar with yet. However, approximate numbers mention as low as 2 million up to as high as 30 million. Scientists cannot still determine the correct number, but it is somewhere between 2 and 30 million species.
Most of the organisms (Living things/Biotic) need nonliving (abiotic) things to live in, such as caves, tunnels, under rocks (for the smaller ones.), water, etc.