It took 80,000 generations for people to utilize advanced tools such as spears and bows and arrows. It took less than two generations for everyone to become proficient on the internet.
How can we account for this?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

What is the most appropriate method of gaining weight (muscle mass)