1. Why is life on Earth not possible without plants? Explain using elements/ CO2 O2 and H2O

Life on Earth would not be possible without plants. Plants take in CO2 (carbon dioxide) and give out O2 (oxygen). Plants also need H2O (water) to keep them alive which they use in a process called photosynthesis. O2 is what all living beings need to survive on this planet. That and H2O.

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i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg