How much of earths surface is covered by the world ocean

Biology 1c cumulative exam i need awsners

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes