The yolk sac functions to form blood cells in early development. provide nutrients to the fetus when the umbilical cord is disconnected. store metabolic wastes until the fetus is born. give rise to the primary germ layers.

Damage to the pyloric sphincter might result in which of the following conditions? Select one: a. Poor absorption of nutrients by the large intestine b. Acid reflux resulting in painful heartburn c. An inability to control urination d.

Explain why cell differentiation is an important part of the development of a multicellular organism.

Can you observe evolution taking place

How would you classify the spread of disease as an effect of air travel

Explain how the Earth's surface can change as a result of global warming.

What is the difference between bacillus, coccus, and spirillum

What is always true of scientific practices a. They prove a hypothesis to be correct b. They involve steps performed in the same order c. They seek to produce verifiable data d. They lead to the same interpretation

Which statement is true about the scientific method

How do cells correct errors in DNA that would disrupt their function

Which is true of oxidation? a) It is a physical process b) No change occurs in the makeup of rock c) Rocks weather at different rates d) Water freezes in cracks in rock