Scientist at a university labortoy study plants in a certain forested region to dertermannif any of the plants have a medical benifitthe region has recentally experianced a decrease of the number of plant speiease avilable for medical research

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

the answer is kevlar

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.