The first cells to encounter a threat to the body are
usually the _________ as they patrol body
__________.
a. neutrophils; surfaces
b. macrophages; interstitial fluids
c. mast cells; linings
d. macrophages; tissues
e. neutrophils; interstitial fluids
Answer: b
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What is represented by the part of the figure labeled as “B”?
a. normal tissue b. cancerous tissue c. adipose tissue d. lymph nodes e. red blood cells
Which is not a characteristic of all life?
A. responsiveness B. evolution C. reproduction D. random cell structure
As part of a research project, a graduate student creates an artificial environment in a sealed container. She sterilizes the soil and adds plants, snails, shrews, and a snake. After adding a small artificial pond, she seals the container
During the first several weeks, the plants are thriving and the animals are doing well. However, piles of dropping are beginning to accumulate, and the entire floor of the container becomes covered with a layer of plant debris several inches thick. One probable cause for the problems is that the graduate student didn't A) include any autotrophs. B) include any carnivores. C) add any decomposers. D) include any herbivores. E) put in enough plants.
The size and shape of a finch's beak correlates with its ________.
A. size B. choice of food C. choice of mates D. habitat