18)
an electromagnet is created using a battery, an insulated copper wire and an iron nail. the wire is wra
times and attached to the battery. which pair of changes will definitely increase the strength of the electr
increase the voltage of the battery and decrease the number of turns of the
coil.
decrease the voltage of the battery and decrease the number of turns of
the coil.
increase the voltage of the battery and increase the number of turns of the
coil.
decrease the voltage of the battery and increase the number of turns of
the coil.
19)
describe how resistance affects the flow of current in a circuit.

digestion

it excretes wastes

genetic variation will increase because of a new habitat and food source.

explanation:

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

if, i suppose that a bee stings me swinging my hand away from a bee. then that if, i persist patient when a bee or wasp areas on your surface to investigate a scent or to take h2o and i secreting heavily, the bug ultimately will move of its personal agreement. if i don't need to set for it to disappear, lightly and gently wipe it off with a part of the paper.