answer:
it took 17,000 years for CO2 to go from 200 to 300 ppm.
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Answer:
D
Explanation:
Lymphocytes are the second line of defence
First line of defence indiscriminately defends against all pathogens unlike secondary response which is targeted. First line of defence refers to the external body components like skin, secretions from the body in the alimentary canel
Mucus traps pathogens. Stomach acid kills pathogens
Answer:
the light one will live longer
Explanation:
bc it is at least getting oxygen and it is getting light to make food
Answer:
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Explanation: