When discussing constant returns to specialization, it is realistic to assume that the units of resources required to produce one unit will no matter where a country is on the production possibilities frontier.

answer:

whilst galileo did not propose his own model of the universe, his observational, experimental and theoretical work provided the conclusive evidence need to overthrow the aristotelian-ptolemaic system. his work on forces was to newton develop his dynamics. galileo died in 1642, the year that newton was born.

explanation:

1   all nations face the problem of scarcity because there are limited resources and unlimited wants. nations do not have enough factors of production to produce everything that their population wants. entrepreneurial resources initiate businesses to make new goods and services; labor resources produce goods and services.

2 there are four factors of production: natural resources, labor resources, capital resources, and entrepreneurial resources. natural resources are raw materials from nature that are used to produce goods. trees, water, and grains are natural resources. some natural resources, such as wheat and cattle, are renewable

3 wants

things that you do not need to have in order to survive, but would like to have

needs

things that you must have in order to survive

goods

physical products

services

tasks that a business perform for customers

resources

items that people can use to make or obtain what they need or want

determine

to settle or decide by choice of alternatives or possiblities

4 i really dont know

the answer is account d