Answer:
things that pollute the air
Explanation:
nuclear energy, fossil fuels, gas from cars and other transportation, and these all contribute to greenhouse gases that are harmful to the environment
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4 Movement of less dense material
3 Heating of cooler material
1 cooling of warmer material
2 movement of denser material
Explanation:
The electrical force between two objects is given by the formula as follows :

k is electrostatic constant
q₁ and q₂ are electric charges
d is distance between charges
So, the two force between two charged objects depends on the product of charges and distance between charges.
The answer is B, the heart is the center of the cardiovascular system as one of its main tasks is to distribute blood throughout the body.