Lucy lives near a small pond. Lucy is studying the spread of the invasive plant called purple loosestrife near the pond. Every month for the past two years, she has counted the number of loosestrife plants near the pond. She has also counted the number of other plants, such as cattails, found at the pond over the years. What question can Lucy answer using the data she has collected?
A.
Has the number of cattails gone down as the number of loosestrife plants has gone up?

B.
Do songbirds eat the seeds produced by the loosestrife plants?

C.
What is the best temperature for growing loosestrife plants and cattail plants?

D.
Do ducks like to nest in loosestrife plants more than in cattail plants?

the maximum mass of nh3 is nh3 in grams

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.