A control is a experimental variable that is kept constant or unchanged during an experiment. During a controlled experiment, the controlled variables are held constant to minimize or stabilize their effects on the subject, its unchanging state allows the relationship between the other variables being tested to be better understood.
The giant impact theory — the idea that a catastrophic collision about 4.5 billion years ago between Earth and a protoplanet about half Earth's size created a disk of molten rock, gas and debris that consolidated to form the moon — was first set forth in the mid-1970s.
Answer: a close evolutionary connection between humans and many other mammals
Explanation:
Biological magnification is when the concentration of something (like a chemical or something hazardous) is more concentrated within the levels of the food chain. For example, you have a fly that was consumed by a frog. The fly had a toxin within their body and now the frog has it. It continues to become more concentrated in the frog. The frog is consumed by a bird. The birth now has a more concentrated level of toxin. The bird is then consumed by a human. There is now more concentration within the human.
Bio concentration is related to the water. It's when the concentration within the water is filled with a toxin and the life within the water has a higher concentration within their body.
Answer:
everything except the oxygen as they excrete oxygen