Answer:
Energy can change from one type to another.
D - spine alignment and foot size.
Late australopiths had an S-shaped spine that allowed for balance when standing. Shorter and less flexible toes made pushing off the ground much easier.
This happens naturally, so no proteins are needed.
Frank was bitten by a rattlesnake and given anti-venom containing neutralizing antibodies. Frank will have acquired long-term artificially acquired passive immunity and active immunity naturally he will have as a result.
<h3>What is active immunity?</h3>
Active immunity occurs when exposure to a diseased organism triggers the immune system to produce antibodies against that disease.
<h3>What is passive immunization?</h3>
Passive immunization occurs when the body already receives the antibodies ready, instead of stimulating their production. The main difference is that, in passive immunization, the body does not produce memory cells, fighting the organisms only once.
With this information, we can conclude that Active immunity is when the individual's own body produces an immune response.
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