Answer:
Environmental changes.
Explanation:
If you change the habitat they are used to they might not adapt in time causing their species to die down and they could come close to extinction.
They eat food, they drink water, they need vitamins either from the sun or soil to nourish themselves, they grow overtime, lastly but most importantly, they are affected by weather.
Answer:
2.ln the analysis you calculate heart rate average over 15 second and instaneous
The equation for density goes as follows:

where D stands for density, m stands for mass, and v stands for volume
You plug in your values, and you get...

which turns out to be