What is the basis of biological evolution
A: have a common ancesto
B: struggle for existence
C: Overproduction
D: genetic variation
A: have a common ancesto
B: struggle for existence
C: Overproduction
D: genetic variation
举一反三
- Crop breeding is called "evolution under artificial control". What are the basic elements of species evolution (). A: Variation B: Stability C: Inheritance D: Selection
- Evolution<br/>by genetic drift is aimless, not adaptive.
- A selective sweep refers to what? A: The replacement of pre-existing genetic variation by the variation surrounding a selected allele B: Natural selection that targets a particular--"selected"--allele C: An advanced cognitive capability observed in expanded human social networks D: Patterns of phenotypic variation associated with assortive mating
- 词汇与结构We have to adjust heading to follow the course due to the existence of ________. A: magnetic north B: magnetic influence C: magnetic variation D: magnetic difference
- What do they have in common?