Many plants produce chemicals that are used as medicines. For example, the drug digitalis, which stimulates the human heart, is derived from foxglove, a poisonous plant. What advantage does producing toxic compounds have for the plant?
What will be an ideal response?
In the plant, the compounds are poisons, which we use in small doses as medicines. The poisons protect the plant by making herbivores sick or killing them.
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In humans, which of the following is involved in both cellular respiration and physiological
respiration?
a. the circulatory system b. the respiratory surface c. mitochondria d. the respiratory medium e. blood
Which organisms have a hydrostatic skeleton with a
soft body wall? a. earthworms b. spiders c. sponges d. crabs e. insects
Most of the chemosensory neurons arising in the nasal cavity have axonal projections that terminate in the _____
A) gustatory complex B) olfactory bulb C) occipital lobe D) posterior pituitary gland
Parvovirus B19 causes a fatal anemia in the fetus.
Answer the following statement true (T) or false (F)