Natural and synthetic chemicals in the environment that can harm the human nervous system are called ____.
A. insecticides
B. herbicides
C. neurotoxins
D. chemotoxins
E. antibodies
Answer: C
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Use the following diagram to answer this question.
These are known to pass close to Earth.
A. Comets only B. Comets and asteroids C. Asteroids only D. Neither asteroids nor comets
Dunes that have a pyramidal shape with ridges of sand radiating out from a high center point are called _______________ dunes
Fill in the blank(s) with correct word
An example of a density-independent factor would be ________
A) a plant parasite, such as mistletoe B) blight (a mold disease) in a wheat field C) cold weather causing a lake to freeze D) suitable nest sites for a flock of warblers E) a specialist searching for the one species of plant that is its food
Arid climates (B) are not found in the Southern Hemisphere
a. True b. False Indicate whether the statement is true or false