A bird, the Common Yellowthroat, has evolved a specific birdcall that can be made and understood by no other species of bird. This is an example of a genetic adaptation through variations in_[blank]_. behaviorbehavior , ,

structurestructure , ,

physiologyphysiology , ,

metabolism

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

The cluster of developing cells from conception until birth is called an