_______1. Venus, Earth and Mars are part of the inner “rocky” planets. _______2. Mars is considered to be earth’s twin planet. _______3. Rotational speed of Venus is extremely slow. _______4. Water is one of the most important prerequisites of life. _______5. Earth and Mars are the right size to hold a sufficient-sized atmosphere. _______6. Mars is denser compared to Venus _______7. The terrestrial planets get too much sunlight for life while the Jovian planets get too little. _______8. Atmosphere is important to the existence of organisms because it contains gases such as carbon dioxide and oxygen which are very useful for organisms’ growth and survival. _______9. Hydrosphere aid in the proliferation of life because it serves as ways for transportation and it protects us from the sun’s radiation. _______10. Presence of water, breathable atmosphere and energy from the sun are the only requirements for a planet to be habitable.
