4. The main reasons for using fossil fuels for our energy needs are: (pick 2) 2 points

cheap

Explanation:

the companys do this because it is fast and easy, if you are making solar panels or wind turbines then it takes a while to get the company making money but if you use fossil feuls its cheaper and faster

Convenient, Cheap.

Explanation: Fossil Fuels are easy to gather and provide a lot of energy. The method for gathering fossil fuels is relatively energy-low meaning that once gathering you are energy positive (gained more energy than used) and with such large amounts in easy-to-access locations, they are incredibly cheap compared to fuel alternatives like wind and algae fuel.

Animal ; prokaryote ; plant ; virus

Explanation:

Animal:  An animal cell possesses cell membrane, ribosomes, lysosomes and nuclear membrane.

Prokaryote:  In a prokaryotic cell, cell wall is present  such as bacteria, ribosomes are present  but nuclear membrane is absent

Plant: A plant cell possesses cell wall, ribosomes, nucleus and a large vacuole.  

Virus:  Viruses reproduces inside a cell  because they do not have their own energy producing system, nucleus is absent  but nucleic acid ( DNA or RNA) is present