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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River blindness is caused by ________
a. infectious amoebas b. Chlamydia trachomatis, an infectious bacterium c. syphilis d. roundworms transmitted by biting flies
A 9:7 ratio indicates incomplete dominance
Indicate whether the statement is true or false
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.
Invertebrates on land use __________ or __________ systems for gas exchange. Fill in the blank(s) with the appropriate word(s)