What are the two main categories of ecosystems?

a.

effective and ineffective

b.

marine and freshwater

c.

biotic and abiotic

d.

aquatic and terrestrial

Double fertilization has great survival value because

How does temperature change the water's cohesion

Sunflowers belong to which of the following kingdoms? a. Animalia b. Fungi c. Plantae d. Protista

jonathan is hybrid for blue eyes. His wife Carly, has blue eyes. If they have four children, how many will have blue eyes?

Why do all members of the animal kingdom belong in the eukarya domain?

Prudence and Charity are twins raised at the center of a rotating kingdom. Charity goes to live at the edge of the kingdom for a time and then returns home. Discuss which twin is older when they rejoin.

Sue has normal hearing but her sister suffers from deafness determined by a rare recessive allele. what is the probability that sue's phenotypically normal daughter is heterozygous for the gene?

Describe two factors that cause variations in climate?

A demonstration is performed during a lecture on muscle physiology in which a student is asked to fully extend his right arm with the palm up. Two large textbooks are placed on his palm, one at a time.

How is it that the heartworm is able to multiply in numbers at such a fast rate?