Ecosystem diversity
A. is the diversity of animal species within a defined geographical area.
B. is primarily associated with aquatic habitats.
C. refers to the structure and function within an ecosystem.
D. includes only species-rich ecosystems.
C. refers to the structure and function within an ecosystem.
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In a bacterial cell, the three genes of the lactose operon are
A) expressed continuously. B) expressed when lactose synthesis is required. C) expressed only in the presence of lactose. D) never expressed, because they are pseudogenes.
New alleles arise by
a. mutation. b. migration. c. genetic drift. d. random mating. e. independent assortment.
What is the exchange of gases between the atmosphere and the blood through the alveoli called?
a) external respiration b) internal respiration c) inhalation d) cellular respiration
What are the main causes of biodiversity loss?
A) Habitat destruction, overharvesting, and invasive species B) Invasive species, pollution, and climate change C) Habitat destruction, invasive species, and climate change D) Habitat destruction, overharvesting, invasive species, pollution, and climate change