No, an element is a pure substance, it cannot be broken down into simpler substances or be decomposed by chemical means.
Endothermic is when the compound absorbs energy in the reaction. Exothermic is the opposite: the compound releases energy in the reaction.
Answer:
This:
Explanation:
Black holes occur when a massive star or larger reaches the final stage of it's lifespan. The star implodes and a black hole is the dying star's remains
increased global populations would probably be a big one
This is true as some parts cannot be checked but the radioactive substances can be used in x-rays