Answer:i would help but i dont know wha part A is :/
Explanation:
As for the first part, Cost, Radiation exposure to humans, No water or heat, and unfit soil. As for the second, Astronomers, Botanists, and obviously your fair share of rocket scientists and math matitions for the way up.
Answer:
(c) Community composting should begin soon.
Explanation:
When using if and can't they both have the similar "self doubt" aspect in them. Like "If I can do it..." and "I can"t do it." Both of these statements are basically questioning their self worth.
