<h2>Answer with Explanation </h2>
The elements that are required for the human body are in fixed percentages Whatever the weight of a person the percentage remains the same. Like 70-90% water is present in the human body whatever the weight of a person but the percentage of water remains the same in the body. There are six main elements present in the body which are basic and necessary for the human body are oxygen, nitrogen, carbon, phosphorus, calcium, and hydrogen.
A sentence :
i read a book about "responding variable".
hope that helped!!
Lots of factors play different kinds of roles on ecosystems.
Ecosystems are never constant because there are so many levels and layers of animals to each one. It's impossible for the headcount of each species to stay the same within an ecosystem when instances such as flooding, drought, poisoning, and hunting can take part.
Let's say the hawk, who is over the bunny on the pyramid, gets poisoned by water. Now, there's fewer hawks, which means there's less predators to hunt the bunnies, hence causing more bunnies and even increasing the chance of overpopulation.
The animals within ecosystems keep each other in check, but numbers are constantly going up and down as things happen. Natural disasters, pollution, and anything such as, effects the ecosystem, therefore it cannot remain constant.
I know some of them.
For instance, blood cells, nerve cells, sperm cells, and egg cells.
Answer:
A
Explanation:
A is right
I think. But I am not 100 % sure
