People who have an extra x chromosome could have gotten it through
(a) nondisjunction.
(b) transposition.
(c) transduction.
(d) crossing over.
(e) all of the above.

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

Match with o for organic and i for inorganic for each compound

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere