21.
What reason does the professor give for the difference in marmot
behavior patterns? ()
A: Type of food available
B: The size of the population
C: Interaction with other marmot species
D: Adaptations to the climate
What reason does the professor give for the difference in marmot
behavior patterns? ()
A: Type of food available
B: The size of the population
C: Interaction with other marmot species
D: Adaptations to the climate
举一反三
- Population density is the total of people in a country， which does not relate the size of the population to the resources available。 （ ）
- The ecological niche of a species refers to: A: Position of the organism in the food web B: Role in the community and all associated biotic and abiotic factors C: Mode of reproduction and food habits D: Behavior in relation to other species in the community
- What reason does Wickham give Elizabeth for his dislike of Darcy?
- The<br/>main factors affecting the selection effect are () A: The<br/>genetic composition of the population B: The<br/>size of the population C: Genetic<br/>characteristics of traits D: Selection<br/>criteria and accuracy of identification
- ______ <br/>are the principles and standards that guide our behavior toward other<br/>people.