Cow's milk
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Answer:
It is important because plants respond to light depend, logically enough, on the plant's ability to sense light. Phototropism is a directional response that allows plants to grow towards, or in some cases away from, a source of light. Photoperiodism is the regulation of physiology or development in response to day length.
Receptor proteins, they then send out the signal to perform a task or duty
Answer: entering a host cell and making copies of itself
Viruses reproduce by infecting a host cell, and making it produce copies of a virus instead of antibodies. This is how viruses double in your body.
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Answer:
Earth was barren, flat and almost entirely under water 4.4 billion years ago
Explanation:
