Explanation

Explanation

Answer:

C

Nuclear power reactors are operated at low temperatures and consequently with lower efficiency because  The walls of nuclear reactors cannot withstand high temperature

Explanation

The molecules in a solid are closely packed together and contain the least amount of kinetic energy. 

Explanation

Explanation

The ozone layer is depleting:Air pollution

Explanation

The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone.

The heart pumps blood through the network of arteries and veins called the cardiovascular system.

Explanation

There are four stages in coal formation: peat, lignite, bituminous, and anthracite. 

Explanation

An amino acid is an organic molecule that is made up of a basic amino group (−NH2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to each amino acid. 

Explanation

Answer:

A

In the former, it is violent and rapid creation with release of much heat energy while in the latter it is a generally slow reaction with release of less heat energy

Explanation

Answer:

B

urea 

 Urea with 46% N has the highest nitrogen content of all solid fertilizers. UAN solutions such as B. 28% and 32% liquid nitrogen are composed of various forms of nitrogen.