The first organisms on Earth were able to transform the carbon dioxide in the air into what essential element needed for modern life?

A. Hydrogen

B. Helium

C. Nitrogen

D. Oxygen

If one strand of DNA had the same sequence aactgtg, what will be the nucleotide sequence of the complementary strand?

Which of these chemicals contains a carbon-carbon double bond? A. C2H6 B. C2H4 C. C2H2

Organism that causes red tide when present in large numbers

Every year the number of vehicles on the roads are increasing. these vehicles release many harmful gases into the atmosphere. what effects does this have on living things?

What Type Of Solid Is CandleWax

Which organisms are most closely related?

Which of these genes are located on the q arm of chromosome 17?

What do autotrophs do durring photosynthesis?

What is a reproductive strategy? O A. The way that a species hides from prey O B. The way a species produces offspring O C. The adaptations that an offspring passes on O D. The DNA that is passed onto an offspring

What are the three things needed for photosynthesis