A behavior that benefits others at a cost to oneself is known as

A. cooperation.
B. altruism.
C. aggression.
D. group selection.
E. cognition.


B. altruism.

Biology & Microbiology

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Which of the following is the correct sequence of events during mitosis?

A. Sister chromatids split, nuclear membrane dissolves, nuclear membrane forms, chromosomes line up B. Nuclear membrane dissolves, chromosomes line up, sister chromatids split, nuclear membrane forms C. Nuclear membrane forms, chromosomes line up, sister chromatids split, nuclear membrane dissolves D. Chromosomes line up, nuclear membrane forms, nuclear membrane dissolves, sister chromatids split

Biology & Microbiology

Which type of growth curve is pictured for the accompanying photo of a desert shrub?

a. type II b. logistic c. type I d. exponential e. type III

Biology & Microbiology

The heart rate decreases in response to the arrival of _____

A) acetylcholine B) endorphin C) nitric oxide D) gamma-aminobutyric acid (GABA)

Biology & Microbiology

Which of the following best describes IgM antibodies?

A) They cause basophils and eosinophils to degranulate. B) They are the most common type of antibody in the blood during the initial stages of an immune response. C) They are the antibody class found in body secretions. D) They interact with phagocytes and NK cells. E) They can cross the placenta to provide passive immunity.

Biology & Microbiology