How does earth’s tilt affect climate?
the larger the tilt, the smaller the temperature difference is between summer and winter.
the larger the tilt, the warmer the summer.
the smaller the tilt, the smaller the temperature difference is between summer and winter.
the smaller the tilt, the warmer the summer.

ANSWER:

The Earth’s tilt affects the climate because, if the Earth’s tilt is towards the sun, the season is summer.

Thus, the larger the tilt, the warmer the summer is the correct answer.

EXPLANATION:

The earth is tilted at an 'angle of 23.5 degrees' and rotates about its axis in addition to revolving around the sun. It is the revolution of the earth that causes changes in the seasons.

When the earth is tilted more facing the sun, the earth gets more sunlight. This means that the intensity of the sunlight would be more and therefore the summer will be warmer in addition to longer duration of days and shorter nights.  

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.