A visitor to an American tropical forest will probably never get to see a jaguar, the largest native cat species in the Americas, but will see many plant-eating monkeys

Use your knowledge of energy pyramids to explain the rarity of the predatory cats.


There should normally be fewer predators (and less biomass) at the secondary (or higher) consumer level than at the primary level.

Biology & Microbiology

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Bacteria that may form endospores include

A. E. coli. B. Pseudomonas and Micrococcus. C. Clostridium and Bacillus. D. Enterococcus and Deinococcus.

Biology & Microbiology

Bacteria are helpful to humans in many ways, including all of the following EXCEPT which one?

A) production of antibiotics B) breakdown of raw sewage C) digestion of cellulose in the human intestine D) production of soy sauce E) production of vitamins for the human body

Biology & Microbiology

Most radiolaria have an internal skeleton made of ________.

A. microtubules B. cellulose C. glycoproteins D. siliceous material

Biology & Microbiology

Which of the following is a recognized way that the processes of natural selection and speciation may mitigate the concerns of conservation biologists? 

A. The fragmentation of habitats promotes geographic isolation of populations, an important aspect of speciation. B. Species that go extinct provide additional resources for populations that remain intact. C. Hybridization between an introduced and a native species can promote speciation, especially in plants. D. Hybridization between two introduced species can promote speciation, especially in plants.

Biology & Microbiology