three children exhaust themselves trying to push a large rock that does not budge. have they done any work? explain your answer.

Answer:

pushes back against the hand

Explanation:

This can be explained by Newton's third law.

Newton's third law states that every action corresponds to a reaction, of the same module, the same direction and opposite directions. This means that when we push on a surface, beings are pushed by the surface, in the same direction but in opposite directions. The same is true when we hit a surface with your hand. Our hand will receive the same blow that the surface received, in the same direction and in the opposite direction.

For this reason, we can say that if a man pushes a table with his hand, his hand will be pushed by the table too, but in the opposite direction. If the man pushed the table forward, his hand will be pushed back.

Answer:

Pushes back against their hands.

Explanation:

The table pushes back against their hands. This is why we can't break objects easily.

Answer:

The correct answer is option C, Chromosome

Explanation:

The structure of chromosome consists of DNA forming a tightly coiled structure around associated proteins mainly histone. The DNA looks like thread like structures which are packaged to form chromosome. So the basic structure of all the chromosomes consists of a DNA molecule and a protein. The double stranded DNA loops around the histones twice to form nucleosome which are considered as building block of chromatin packaging

Answer:

The producers can be described as organisms which are able to make their own food through the process of photosynthesis. Phytoplankton is hence the producers in this food chain.

Primary consumers can be described as organisms which feed on the producers. Copepods are the primary consumers in this food chain.

Secondary consumers can be described as organisms which feed on the primary consumers in a food chain or food web. Sea-nettle jellyfish is the secondary consumer in the above food chain.