TASK DEFINITION: You are given two sentences. You have to find if there is entailment or agreement of the Hypothesis by the Premise. From the given pair of sentences, you should identify if there is enough information in the Premise to support the claim made in the Hypothesis. The Premise may not exactly be the same as Hypothesis. Your task is to return 'entails' if the premise supports hypothesis else return 'neutral'.
PROBLEM: Premise: These are valves at the two exits of the heart that prevent backflow into the ventricles. 
 Hypothesis: Heart valves prevent the backflow of blood from happening in the heart.

SOLUTION: entails

PROBLEM: Premise: There have been five major extinctions of life forms on the earth since life arose over a billion years ago. 
 Hypothesis: There have been five major massive extinctions since life began on earth.

SOLUTION: entails

PROBLEM: Premise: Most ecosystems on Earth derive their energy either directly or indirectly through the Sun and the process of photosynthesis. 
 Hypothesis: Most of the energy used by living things comes either directly or indirectly from the sun.

SOLUTION:
entails