1. which of the following statement best describe recessive trait?
a.a trait that a person carries but never affect the phenotype
b.a trait only visible when organisms are heterozygous for the responsible gene
c.the least common variation of that trait in a population
d.a trait that is not common in yor family
e. a trait that appears when a person has two recessive alleles for that gene.

2. an unexpected freeze that kills a population of chipmunks is an example of
a. a density independent factor
b.a natal effect

c. a density dependent factor
d.an intrinsic factor

3. why is the water so important in controlling the earth's climate?
a. water vapor is one of the green house gases that help trap hear
b.the water in oceans and lakes stores the energy radiated by the sun and releases it slowly
c.water may absorb and store a lot of energy by warming up by a few degrees only
d.all the above