The eight planets in alphabetical order are earth, jupiter, mars, mercury, neptune, saturn, uranus, and venus. half of them are inner planets and half of them are outer planets. which of these planets are inner planets?

a. mercury
b. jupiter
c. earth
d. mars

Option A,C and D.

Mercury, Earth and Mars.

Explanation:

Inner planets are planets that are closer to the sun. Astronomers called them terrestrial planets because the are small,solid, have rocky surfaces, and have similarities with deserts and mountaineous areas of the Earth.

There are four inner planets and are arranged in order of distance from the sun, from closet to farthest. They are Mercury,Venus, Earth and Mars.

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.