Blankis harmful materials entering the environment.

it could be pollution or litter or something along those lines. It kinda stinks that it doesn't have multiple choice tho :(.

Explanation:

i hope this is able to help a little bit :))

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.