The answer is chlorophyll.
<h2><em>what is the main theme in reproduction.</em></h2>
- <em>The five central themes of biology are</em><em> </em><em><u>structure and function of cells, interactions between organisms, homeostasis, reproduction and genetics, and evolution</u></em>
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<em>#</em><em>c</em><em>a</em><em>r</em><em>r</em><em>y</em><em> </em><em>on</em><em> learning</em>
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Eggs
Explanation:
Production of egg is called oogenesis. (One egg)
Answer:
Hemagglutinin is an envelope viral protein used to attach to host cells and gain entry via endocytosis