Which macromolecules have a basic unit that is composed of phosphate, a sugar ring, and one of five different base?

The scatterplot shows the densities of planets in the solar system and their relative distance from the Sun in order from closest to the Sun (Mercury) to farthest from the sun (Neptune).

During which era in earth's history did dinosaurs roam the earth? A. Mesozoic B. Cenozoic C. Paleozoic D. Precambrian

The major cause of air pollution is: a. industrial waste b. sewage and pesticides c. car exhaust d. radioactive waste

This is the force of attraction between an object and the earth due to gravity.

Who discovered tRNA, the first non-coding gene product discovered

An organism that is heterozygous for a particular character will generally show the recessive trait. a. true b. false

Some speciea undergo long peiods of stability interrupted by geologically brief periods of signifficant change. During these brief periods, new species may evolve. This pattern of evolution is part of the concept of

Darwin and Haeckel used the analogy of a wheel to represent phylogenies.

What is allele frequency

Why do rocks vary in color?