Which of the following may not have been possible without the presence of ozone in the atmosphere? Respiration may never have developed.
Oxygen may not have been able to accumulate in the atmosphere
Life may not have been able to move onto Earth’s land surfaces.
Photosynthesis may never have developed.

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Plants that have reproductive structures called cones are?

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.