The risk of developing cancer can be decreased by:
a. increasing the amount of nitrates in the diet.
b. exposing questionable tumors to x-rays.
c. avoiding smoked, and salt-cured foods.
d. examining the breasts and testes every two years.
e. exposing neoplasms to UV radiation.
c
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Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding. B. They have a U-shaped digestive tract. C. They have a true coelom. D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda. E. They are parthenogenetic.
River blindness is caused by ________
a. infectious amoebas b. Chlamydia trachomatis, an infectious bacterium c. syphilis d. roundworms transmitted by biting flies
Invertebrates on land use __________ or __________ systems for gas exchange. Fill in the blank(s) with the appropriate word(s)
A 9:7 ratio indicates incomplete dominance
Indicate whether the statement is true or false