9. a recessive allele will only be expressed when .
a. a dominant and a recessive allele are present.
b. there are two dominant alleles.
c. there are two recessive alleles.
d. there is only one allele.

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

Environmental impacts on evolution : mastery test

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present