If our bodies are capable of secondary responses, how do people contract influenza more than once?
a. Memory cells lose their ability to recognize antigens after six months.
b. The affinity of antibodies diminishes in the secondary response.
c. New varieties of flu virus continuously evolve.
d. Our bodies cannot launch a strong enough immune response against the flu virus.
e. There are no effective vaccinations for the flu.
c
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Freshwater sponges reproduce asexually by forming resistant internal buds called
(a) spicules. (b) larvae. (c) ovaries. (d) gemmules.
When oxytocin is released during childbirth, the hormone targets cells in the
A) kidneys. B) breasts. C) hypothalamus. D) uterus. E) breasts and uterus.
A developmental theory is a systematic statement of general principles that provides a framework for understanding how and why people change as they grow older.
Indicate whether the statement is true or false.
Name the four different nitrogen-containing bases that are found in DNA
What will be an ideal response?