whats the purpose of age structures? a) they ...
whats the purpose of age structures? a) they provide a way to study the overall age demographics of a population. b) to advocate for small class sizes in schools c) they can be used to plan for the number of nursing homes needed in a given area. d) to know how many children live in a specific community question 15 (5 points) an atom has 35 protons, 35 neutrons, and 35 electrons. whats the estimated mass of the atom? a) 38 b) 73 c) 70 d) 35
Answer
### Question 1
# Brief Explanations:
Age - structures show the age - distribution of a population. They are used to analyze overall age demographics. Options B, C, and D are too specific and not the main purpose.
# Answer:
A. They provide a way to study the overall age demographics of a population.
### Question 2
# Explanation:
## Step1: Recall atomic mass formula
Atomic mass = number of protons+number of neutrons (electrons have negligible mass).
## Step2: Substitute values
Given 35 protons and 35 neutrons, atomic mass = 35 + 35.
## Step3: Calculate
35+35 = 70.
# Answer:
C. 70