Which of the following gasses is necessary for photosynthesis, but is especially damaging in terms of global warming when it is too common? carbon dioxide hydrogen nitrogen oxygen

Which of the following is a common danger of commercial fishing?

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.