Which statement is true about nuclear fusion?
it is caused by the same process that causes nuclear fission.
it does not occur naturally in the solar system.
it has very low activation energy.
it produces nearly all the elements that are heavier than helium.

The correct answer is option D which is It produces nearly all the elements that are heavier than helium.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e