Where does most of Earth's available carbon come from? А
the constant process of photosynthesis
B
sunlight that is transferred from the Sun to Earth
с
the convection process that occurs in Earth's mantle
D
dead organisms that are recycled back into the environment

A

Explanation:

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a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

so whats the answer