A mature collection of species, called a ____ ____ , makes up the final stage of succession

Fill in the blank with the appropriate word.


climax, community

Biology & Microbiology

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Peahens prefer to mate with peacocks that have

the brightest and largest tail displays. The peacock’s tail is, in and of itself, a disadvantage to the males. It is large and cumbersome and the males are more easily caught by predators because of it. Given these facts, why isn’t the peacock’s tail selected against by natural selection?

a. peacocks lack the mutations to allow selection to work b. it is working- peacocks are slowly going extinct c. in spite of the disadvantage, peacocks with larger tails leave more offspring d. it is selected against but because a peahen gives birth to so many males, the population is not greatly affected e. this is one of those mysteries of biology

Biology & Microbiology

In which of the following would it be possible to find the most dilute urine?

1.proximal tubule 2.loop of Henle 3.distal tubule 4.collecting duct

Biology & Microbiology

The protostomes are animals whose

a. stomach is in front of the crop. b. mouth is covered by a fleshy lip. c. blastopore becomes a mouth. d. digestive tract is lined by mesoderm.

Biology & Microbiology

Defending the body against bacterial infection and invasion by foreign substances is a function of

a. red blood cells b. plasma c. platelets d. white blood cells

Biology & Microbiology