Before constructing a hypothesis, a scientists must first
a. make a guess
b. do background research
c. analyze their data
d. conduct and experiment

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

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b. a light particle

Describe the layers of the suns atmosphere?