An example of a grad-school level question?
The cows in a rancher's herd of cattle have been selectively bred to produce milk. Which of the following will cause the next generation of cows to receive the trait for producing large quantities of milk?

An example of a grad-school level question?
Rocks and Earth and on the Moon are made of similar materials. What does this observation most likely suggest?

An example of a grad-school level question?
In any ecosystem, organisms interact with biotic and abiotic parts of the environment. As a result of all of the interactions, the matter within the system is

An example of a grad-school level question?
Which three systems of the human body function together to move and control body parts?