Answer:
True, planets are round because of gravity
Answer:
Los solsticios es cuando el sol alcanza su mayor excursión. Con respecto al Ecuador, en el hemisferio norte +23 grados y en el sur - 23 grados,
Explanation:
Answer:B
Explanation:
The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
I'm thinking either the first or second answer. Sorry if this doesn't help.<span />
Oxygen entered the Earth's atmosphere after the appearance of the Great Oxidation Event (Great Oxygenation Event). The Great Oxidation is the first mass extinction on Earth.
The Great Oxidation lasted 2.4 to 2.0 billion years ago.
Oxygen appeared on Earth thanks to cyanobacteria using photosynthesis.
