Baleen plates are composed of:
a. calcium carbonate.
b. cellulose.
c. keratin.
d. chitin.
e. silica.
C
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Greenhouse gases block
A. carbon dioxide molecules escape from Earth. B. heat escape from Earth. C. oxygen molecules escape from Earth. D. UV wavelengths escape from Earth. E. UV wavelengths from reaching Earth's surface.
Isopropyl alcohol wiped across a skin site can sterilize it.
Answer the following statement true (T) or false (F)
Which of the following always tends to make chemical reactions spontaneous?
A) The reactants have lower potential energy than the products. B) The reactants are more ordered than the products. C) The temperature is low. D) The pressure is low.
Which group of organisms is the main competition to humans for food and plants? a. Cattle b. Birds c. Insects d. All compete equally with humans for food
e. Arthropods