PLATO Identify the relative abundance and descriptions of some of the gases in the atmosphere.

incorporated as a
major component of
proteins and DNA
second most
abundant gas in
the atmosphere
trace gas
required for aerobic
cellular respiration
most abundant gas
in the atmosphere
required for
photosynthesis
does not
react with other
substances

The meselson-stahl experiment demonstrated that dna replication is semiconservative. in the figure, semiconservative replication is illustrated by

The table below shows data for a population of fish in a pond. fish body color # of fins scales? tail shape a silver 4 yes fan b pink 4 yes flat c black 4 yes fan d orange 4 yes flat e orange 4 yes fan f silver 4 yes flat which of the above characteristics would be most in developing a classification system for the fish? a. body color and tail shape b. presence of scales and tail shape c. body color and number of fins d. number of fins and presence of scales

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred