Which statement is a central idea of the article?
Arecent invention will help to prevent plastic
from being dumped into the ocean.
3-D printing is faster and less expensive than
traditional manufacturing processes.
Silicone is a unique material used to produce
rubber that can reform bonds on an atomic
level.
D
A new type of rubber that can repair damage
has the potential to revolutionize a number of
products.

Ethnicity is used to distinguish between groups based on cultural elements, but according to the information presented in the lecture (blank) would encompass the details about a person like the shape of his or her features.

Children begin to use tools at about what age? a. 18 months b. 2 years c. 1 year d. 6 months

In 1914, alabama produced 1.7 million bales of cotton, but three years later produced only 515,000, bales. meanwhile, in georgia, 5.2 million acres of land was dedicated for cotton production in 1914, but by 1923 there were just 2.6 million acres used for growing cotton. all of this was the result of the work of a tiny insect: the boll weevil. alabama and georgia first felt the effects of the boll weevil at different times. what would account for this difference in timing? a) the infestation moved from west to east. b) the infestation moved from east to west. c) georgia had better ways to deal with the problem. d) alabama was further from the insect's point of origin.