Why is river water less clear at the mouth than at the source? a)because the source is warmer
b) because the mouth is warmer
c) because the mouth has debris
d) because the source is colder

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

The two main stages of cell division are called

What is the importance of dna replication to all living organisms?