Explain the following sentence:
Humans are ureotelic.

Explain the following sentence: Sharks retain more urea in their blood.

Explain the following sentences: Energy obtained from fossil fuels is not green energy.

Explain the following sentences: Saving energy is the need tof the hour.

Explain the following sentences. Energy obtained from fossil fuels is not green energy.

Explain the folowing sentences. Saving energy is the need of the hour.

Explain the following sentence with neat diagram. A tree far away from us can get hidden behind a book held very close to our eyes.

Explain the following in details: Proteins

Explain the longest bone in human body.

Answer the following in one sentence: What is an artifical satellite?