Economists often use an economic model that reflects the total amount of goods and services required at all possible price levels during a specific period of time. which term is most often used to describe the information contained in this model?
a. business cycle
b. market self-regulation
c. money demand curve
d. aggregate supply and demand

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Acommon kind of mechanical weathering is called