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.

Explanation

The world's biggest killer is ischaemic heart disease, responsible for 16% of the world's total deaths. 

Explanation

Answer:

D

Fans help by replacing hot and humid air with cooler, dry air that allows for more evaporation. Cold air evaporates sweat and creates a wind-cooling effect that cools us without affecting room temperature.

Explanation

Answer:

c

The Ferro-chromite rod aerial antenna is a form of RF antenna that is almost universally used in portable transistor broadcast receivers as well as many hi-fi tuners where reception on the long, medium, and possibly the short wave bands is required.