In a population of birds in africa, it was observed that birds with small or large beaks could efficiently crack and eat small or large seeds, respectively. birds with intermediate beaks had trouble with both types of seeds. what type of selection would be expected to occur in this population if small and large seeds were the only types of food available to these birds?

Disruptive selection

Explanation:

In this example, the type of selection that is expected to occur in the population is disruptive selection. Disruptive selection refers to changes in the population in which extreme values for a trait are favored over intermediate values. In this process, more individuals acquire a characteristic that is at either end of the distribution curve.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

i’m   sure probably just geuss and see which one you can get right, i’m pretty sure it is the combination of goods and services