Which describes a similarity between abiotic and biotic factors? a. They may include things that were once living. b. They are both necessary for organisms to survive. c. They are not usually important parts of the environment. d. They can be easily replaced if they are used or destroyed.

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