Question

humans display which type of survivorship curve in demographic analyses?

type i--low mortality early in life, high mortality late in life
type ii--steady mortality rate
type iii--high mortality early in life, low mortality late in life

question 15 (2 points)
the human brain and head reach adult size around the age of ______.

13 yrs
3 yrs
18 yrs
7 yrs

Explanation:

Analyze human survivorship curves

Humans generally invest heavily in parental care, leading to high survival rates during early and middle life. Most individuals survive to old age, where mortality rates then increase sharply. This pattern corresponds to a Type I survivorship curve.

Analyze human brain growth

The human brain grows rapidly during early childhood. By age 6 to 7 years, the brain has reached approximately 90% to 95% of its adult volume, and the head size is very close to its final adult dimensions. Among the choices provided, 7 years is the most accurate representation of when the brain and head reach adult size.

Answer:

Question 1

• Type I--low mortality early in life, high mortality late in life (Correct answer)
• Type II--steady mortality rate
• Type III--high mortality early in life, low mortality late in life

Question 2

• 13 yrs
• 3 yrs
• 18 yrs
• 7 yrs (Correct answer)