Xiao is gathering research on the number of meals people eat. He gathers data about the number of daily meals eaten by 25 people at each of the following ages – 10, 20, 30, 40, 50, 60, and 70 years – over the course of one week, and looks for developmental differences. What type of research design is Xiao using?

a. Continuous
b. Cross-sectional
c. Sequential
d. Longitudinal

What is meant by a symmetrical unimodal distribution? a. a distribution is the frequency at which a certain value of a variable is obtained during a study. a symmetric unimodal distribution is a distribution where there is one value with a larger frequency than any other and the pattern of frequencies on the left and right of this larger frequency are mirror images of each other. b. a distribution is a pattern of frequencies for the various values of a variable collected in a study. a symmetric unimodal distribution is a distribution where there is one value with a larger frequency than any other and the pattern of frequencies on the left and right of this larger frequency are mirror images of each other. c. a distribution is the frequency at which a certain value of a variable is obtained during a study. a symmetric unimodal distribution is a distribution where there is a uniform frequency, meaning the frequency of every value is same, and the pattern of frequencies on the left and right of this larger frequency are mirror images of each other.

Cattle are herbivores by nature and feeding herbivores a diet for carnivores may have triggered a protein reaction known as a prion causing mad cow disease

The middle east has very limited fresh water sources in the form of rivers such as the nile, jordan, euphrates, and tigris rivers. however, these rivers are only located in a few countries. which country does not have one of these rivers within its borders?