Answer:

Explanation:
The integrated rate law for radioactive decay is

1. Calculate the decay constant

2. Calculate the half-life

It went under a physical change because it (1) changed color. (2) changed form.
Animals are able to see much more clearly in the dark than humans can.
Or
Humans are able to see much more clearly in the dark than animals can.
The scientific method is defined as a method of research in which a problem is identified, relevant data is gathered, a hypothesis is formulated from this data, and the hypothesis is empirically tested.