What are possible explanations for the fact that you (for example) may require twice as much of a drug to get an effect as does your friend?

If you require 2x the amount your friend takes, it’s probably because you way more, you’re taller, and or older.

Ithink it would be a and b

1.)dr. natterson- horowitz came to realize that their isn't much of a difference between animals and humans. just like humans, animals can suffer from illnesses and diseases like breast cancer, self injury, anxiety, and many more. she also discovered how they even treated and performed surgical procedures on animals just as if the animal it self were human. the los angeles zoo called dr. natterson- horowitz because they knew that she was a doctor and that  she would be able to recognize what was wrong with the gorilla. they knew that humans and gorillas were similar, so instead of calling another veterinarian, they called a doctor.