Phytoplankton is mainly found 

A. near the ocean surface.
B. on the ocean bottom.
C. growing on rocks in freshwater streams.
D. only in very cold water.


A. near the ocean surface.

Biology & Microbiology

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Which structure prevents blood flowing back into the atria during ventricular contractions?

A. semilunar valves B. atrioventricular valves C. sinoatrial node D. carotid blood shunts E. foramen ovale

Biology & Microbiology

Which of the following is NOT an effect of global

warming? a. an increase in global photosynthesis b an increase in atmospheric CO2 levels c. a probable increase in extinction of species d. changes in temperature and precipitation patterns e. changes in plant and animal life cycles

Biology & Microbiology

What is a significant difference between X-linked and sex-influenced inheritances?

A) X-linked inheritance affects females and sex-influenced inheritance affects males. B) Sex-influenced inheritance requires epistasis. X-linked inheritance does not. C) There are no differences. They are the same. D) X-limited inheritance is only recessive. Sex-influenced inheritance can be recessive or dominant. E) In X-linked inheritance, the gene in question is on the X chromosome; in sex-influenced inheritance, the gene is autosomal.

Biology & Microbiology

Please explain why allele frequencies have no impact on change in the value of linkage disequilibrium between two loci in a Hardy–Weinberg population

What will be an ideal response?

Biology & Microbiology