What is considered the most primitive true animal?

A) Porifera
B) Cnidaria
C) Annelida
D) Mollusca


A

Environmental & Atmospheric Sciences

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In toxicology studies, LD50 can be best described as the dose ________

A) at which 50% of an exposed population develops a chronic effect from the toxicant B) at which 50% of an exposed population develops disease C) at which more than 50% of the population dies as a result of the toxicant development D) at which 50% of an exposed population is killed or displays a specific symptom E) at which at least 50% of the exposed population is not affected by the toxicant

Environmental & Atmospheric Sciences

Maintaining sustainable human exploitation of ecosystem capital will be increasingly difficult because of

A) over-reliance on grains and other plants as a significant portion of the human diet. B) expanding number of viral and bacterial human diseases. C) growing pressure from human population on Earth. D) changing temperature and rainfall patterns.

Environmental & Atmospheric Sciences

Which of the following bonds is the most polar?

A) C-H B) C-N C) C-O D) C-F

Environmental & Atmospheric Sciences

How many electrons are associated with a single bond?

A) 1 B) 2 C) 4 D) 6

Environmental & Atmospheric Sciences