What substance is united or combined between the sperm and the ovum in order for
fertilization to occur?
O calcium
O deoxyribonucleic acid
O estrogen
O progesterone

Drag each tile to the correct box. match the given symbol or molecular formula to the term that best describes it. element -organic compound -inorganic elemental molecule -inorganic compound -answers given: so2, k, ci2, c6h6

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?