Which of these is used for making rubber and some medicines? a. iron b. sulfur c. platinum d. aluminum

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two