Which of following best describes disruptive selection?

A population of birds, with various size beaks, eats seeds. Small seeds can be eaten by birds with small beaks. Larger, thicker seeds can only be eaten by birds with larger, thicker beaks. There is a shortage of small seeds but that there are still many large seeds. Natural selection will change the population of birds such that birds with larger beaks will survive and produce off springs and birds will small beaks will not be able to survive. What type of natural selection is described here?

Your blood pressure is 120/70. The 120 indicates _____, and the 70 indicates _____.

Which one of the following is not an example of a photoautotroph?

Which statement is true about Sympatric and Allopatric Speciation?

A person with a malformed epiglottis will have trouble _____.

Which statement is true about mammalian heart and blood vessels?

Herbivorous animals can obtain more nutrients from plants than can carnivorous animals because _____.

If two finches belong to the same species, then they

Which part of this figure depicts a pulmonary artery?