How does gas exchange occur in roots?

Which type of respiration takes place when there is no oxygen present

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

Darwin’s hypothesis about how life changes over time is now called?