Answer:
plants did it
Explanation:
The development of organisms capable of photosynthesis caused Earth's atmospheric oxygen to increase. These organisms use carbon dioxide and water to form sugar and oxygen.
Protons - positively charged (+1)
Neutrons - Neutral charge (0)
Electrons - Negatively charged (-1)
Protons and neutrons stay inside the nucleus, while electrons circle the outside.
Answer:
a food web is a collection of many different food chain
a food chain is a collection of many different fong webs
Liquid water is not stable on Mars but was stable in the past because Mars' atmosphere was thicker, trapping carbon-dioxide easily, warming the planet, making water stable. But the atmosphere dissolved, making Mars colder, so now liquid water is not stable.