Answer:
1.Mercury, Venus, Earth and Mars
2.global warming and climate change; water pollution and ocean acidification; and loss of biodiversity.
3.
When I created a country I called it Fire Realms. You could do something based off of that.
Answer:
Radio telescopes, telescopes detecting infrared radiation, gamma rays, and X-rays and space-based telescopes are essential in modern astronomy.
the first plants and anthropodes appear on land approximately about 470 million years ago
