Author Question: The _____ is the inner layer of the embryo from which the lungs and digestive system develop. A) ... (Read 113 times)

LCritchfi

  • Hero Member
  • *****
  • Posts: 519
The _____ is the inner layer of the embryo from which the lungs and digestive system develop.
 
  A) neural tube
  B) mesoderm
  C) endoderm
  D) umbilical cord

Question 2

Which of the following is a difference between primary sex characteristics and secondary sex characteristics?
 
  A) The primary sex characteristics are physical indicators of sexual maturation, while the secondary sex characteristics trigger the development of sex hormones.
  B) The primary sex characteristics are structures that make reproduction possible, while the secondary sex characteristics are not directly involved in reproduction.
  C) The primary sex characteristics include breast development, while the secondary sex characteristics include the ovaries and testes.
  D) The primary sex characteristics respond to pituitary hormones, while the secondary sex characteristics do not respond to pituitary hormones.



enass

  • Sr. Member
  • ****
  • Posts: 380
Answer to Question 1

C

Answer to Question 2

B



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

For a complete list of videos, visit our video library