What are the problems with cloning as a conservation strategy?Check all that apply.
A. Populations of cloned individuals grow too quickly.
B. The root causes of species loss are not addressed by cloning methods.
C. It often requires finding appropriate surrogate mothers.
D. It requires detailed knowledge of species' reproductive biology.
E. It increases genetic diversity of a species beyond natural levels.
Answer: D
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It took 3 million years for the human population to reach 1 billion, 123 years to grow to 2 billion, and 12 years to
grow from 6 to 7 billion.
Indicate whether the statement is true or false.In estuaries,
a. temperature and salinity remain relatively constant throughout the day. b. temperature and salinity vary sharply during the day. c. temperature varies greatly but salinity remains constant. d. salinity varies greatly but temperature remains constant. e. organisms are not well adapted to wide swings in salinity.
What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract B) To move food along the digestive tract C) To secrete digestive enzymes into the digestive tract D) To secrete water into the digestive tract
Viroids cause a variety of plant diseases and are composed only of:
a. strands of RNA. b. strands of DNA. c. protein coats. d. peptidoglycan. e. a capsid.