Which of the following lists the steps of technological development in the
correct order, from first to most recent?
o
a. (1) the kite is invented in china; (2) joseph and jacques
montgolfier invent the hot air balloon; (3) orville and wilbur wright
pilot the first airplane; (4) frank whittle and hans von ohain invent
the jet engine.
b. (1) the kite is invented in china; (2) orville and wilbur wright pilot
the first airplane; (3) joseph and jacques montgolfier invent the
hot air balloon; (4) frank whittle and hans von ohain invent the jet
engine.
o
c. (1) joseph and jacques montgolfier invent the hot air balloon; (2)
the kite is invented in china; (3) orville and wilbur wright pilot the
first airplane; (4) frank whittle and hans von ohain invent the jet
engine.
d. (1) joseph and jacques montgolfier invent the hot air balloon; (2)
the kite is invented in china; (3) frank whittle and hans von ohain
invent the jet engine; (4) orville and wilbur wright pilot the first
airplane.

What are the four basic classes of organic molecules how do they differ structurally and functionally

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased