Energy in an ecosystem flow from consumers to producers.

Energy from an ecosystem flows from a producer to a consumer.

Explanation: The producer absorbs energy from the sun then uses photosynthesis to turn that energy, along with carbon dioxide and water, into it's food, glucose (sugar). Then, the consumer eats the producer as food and receives some of the producer's energy that it made for it self.

i dont know but thats a great qusestion

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.