What is a reason that fossil fuels are often used as an energy source? animals and plants are not affected by their usage. beneficial byproducts are created from their combustion. there is an unlimited supply of them in the ground. they are relatively inexpensive and easy to produce.

They are relatively inexpensive and easy to produce.

Explanation:

Energy plays a vital role in modern world and our day to day life, from lightening our homes and offices to driving our cars and aeroplanes. About 80 Percent energy that we use in modern world comes from fossil fuels

Therefore, we can say that we rely on fossil fuels for our energy demands to a lot of extent. The main sources of energy in the form of fossil fuels are only three that are coal, petroleum and natural gas.

Although the usage of energy generated from fossil fuels creates harmful emission of gases like carbon di oxide and carbon mono oxide, and it is not very safe for the lives of human and animals, but still it is used by major world now adays.

The fossil fuels are also non renewable source of energy and there is a finite amount of them in world, therefore, scientists and environmentalists are focussing on the usage of green source of energy like biofuels etc.

However, the reason why fossil fuels are excessively used by world are :

Therefore, option number 4 is the best option.

Hope it help!

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up