One set of the body's defenses are called "innate." In this context, this means
A. they act indiscriminately against all pathogens.
B. they only act internally.
C. they act only on a very specific subset of potential pathogens.
D. they are lost as we age.
E. phagocytosis is involved.
Answer: A
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True or false: When two populations have undergone allopatric speciation long enough to be unable to produce fertile offspring, then they are different enough to be considered two different species
A. true B. false
What is the correct sequence for the start of an organism's life cycle?
A) fertilization ? meiosis ? zygote ? embryo
B) meiosis ? fertilization ? zygote ? embryo
C) fertilization ? zygote ? meiosis ? embryo
D) meiosis ? fertilization ? embryo ? zygote
Oxygen and carbon dioxide diffuse in and out of a leaf through the
a) palisade mesophyll. b) guard cells. c) xylem. d) stomata.
Which of the following techniques is most commonly used in the prenatal diagnosis of genetic disorders, such as cystic fibrosis, in a human fetus?
A) Chorionic villus sampling B) Isolation of fetal cells from maternal blood C) Amniocentesis