What is a major obstacle in defining "life?"
a. The process of inheritance occurs for both living and nonliving things.
b. Living and nonliving things follow the same taxonomic classification system.
c. Living and nonliving things consist of the same basic components.
d. The concept of life is too intangible to be addressed by experimental research.
e. The smallest unit of life has not been discovered as of yet.
c. Living and nonliving things consist of the same basic components.
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In his study of the Mediterranean fruit flies (Ceratitis capitata), Matthew Gage (1991 ) found that ________
A) males allowed to mate alone produced 2 1/2 times more sperm than those mating in the presence of other males B) males allowed to mate alone produced 2 1/2 times less sperm than those mating in the presence of other males C) males produced the same amount of sperm when they were allowed to mate alone or when they mated in the presence of other males D) males engaged in aggressive behavior when mating in the presence of other males
Suppose that at least one of your parents has Huntington's disease, which is caused by a dominant allele. What are the odds of you inheriting the disorder?
a. 100% b. 75% c. 50% d. 25%
Modern humans have been in existence for approximately how many years?
A) 200,000 B) 100,000 C) 500,000 D) 1,000,000
The visceral mass of molluscs does not contain the
a. circulatory system. b. excretory system. c. nervous system. d. head-foot. e. digestive system.