Answer:
B. it is a community of plants,animals and there physical surrounding.
Answer: There are 0.000043 moles of melatonin.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number
of particles.
To calculate the moles, we use the equation:

given mass = 10 mg = 0.01 g
molar mass of
= 232.28 g
Thus there are 0.000043 moles of melatonin
Yes, they are right.Very good hand writing! You did a very great job on showing your work.
The birds could have more diseases and could pass it to other reptiles