Suppose a biologist wants to investigate the effect of a hormone on egg production in chickens. one group of chickens will receive no hormones treatment. other groups of chickens will receive different amounts of the hormone. for all groups, all other conditions, such a kind and amount of food, feeding time, amount of water, and temperature will be identical.
control group:
experimental variable:
experimental group:
list three control variables:

When a plant is genetically identical to its parent plant what is this called

Giraffes with short necks tend to be unable to access enough food, while giraffes with long necks can reach more food at the tops of trees. this causes an advantage for giraffes with long necks. how would you explain this? a. this is an example of a stabilizing selection in which the intermediate form of a trait is advantageous compared to the extreme forms of the trait. b. this is an example of a disruptive selection in which the population of cacti is divided and well-defined. c. this is an example of directional selection in which one end of the bell curve is better adapted to its environment than the other end. d. this is an example of bidirectional selection in which evolutionary pressures from multiple sources encourage an organism to adapt

Why does red transfer all its momentum to green?