Which of the following statements is not true about stage 3 of the birthing process.

a.

the placenta and umbilical cord are delivered.

b.

it lasts approximately 5 to 10 minutes.

c.

intense contractions occur.

d.

the placenta remains intact.

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

The direct energy source that drives atp synthesis during respiratory oxidative phosphorylation is