B-cells defend the body against invaders by

invading the bone marrow.
attacking cancer cells.
producing antibodies against bacteria and viruses.
making the circulatory system more efficient.

producing antibodies against bacteria and viruses.

Psychology

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According to Piaget, the advances of concrete operations are evident in new abilities for performing tasks of ____

a. the development of motor skills and hand-eye coordination b. egocentrism, animism, and language development c. conservation, classification, and seriation d. hypothetical, deductive reasoning, and hypothesis testing

Psychology

Which of the following terms relates to an eating disorder characterized by bingeing on large quantities of food, followed by purging through vomiting or the use of laxatives?

a) Anorexia nervosa b) Obesity c) Malnutrition d) Bulimia

Psychology