Kayla is studying the effects of hormones that stimulate muscle contraction. What gland would be a s

Kayla is studying the effects of hormones that stimulate muscle contraction. What gland would be a source of at least two such hormones?
 A. Posterior pituitary. 
 
 B. Thymus. 
 
 C. Pancreas. 
 
 D. Thyroid. 
 
 E. Anterior pituitary.

The global human population is 6.4 billion. The birth rate is 21 per thousand per year, the death rate is 9 per thousand per year, and the fertility rate is 2.8 children per woman’s lifetime. What is the growth rate of the world population?
 A. 2.1 
 
 B. 2.8 
 
 C. 1.2 
 
 D. 6.4 
 
 E. 1.0 

The global human population is 6.4 billion. The birth rate is 21 per thousand per year, the death rate is 9 per thousand per year, and the fertility rate is 2.8 children per woman’s lifetime. Which figure below is closest to the number of people added to the planet per year in excess of those that die?
 A. 48 million. 
 
 B. 133.4 million. 
 
 C. 10 million. 
 
 D. 77 million. 
 
 E. 2.8 million.