What structure of the respiratory system allows for gas exchange

alveoli

pharynx

nose

trachea

True or False: DNA molecules are semiconservative because both strands are made from completely new nucleotides

Why are algae considered to be the ancestors of land plants?

How do hormones assist in the maintenance of healthy bone and the release of calcium to be used in other body processes?

Target cell receptors for most water-soluble hormones are located in the:

Describe the relationship between genetic testing and the polymerase chain reaction. How has the PCR technique made genetic testing possible on a large scale? For smart people only

The nurse is educating the parents of a 5-year-old girl with infectious conjunctivitis about the disorder. which information is most important to provide to prevent the spread of the disorder

Which is an example of the way matter cycles through the bodies of living things? A) A fish swims in the ocean. B) The sun heats up a rock. C) One animal eats another animal. D) Trees convert sunlight to energy.

Which of the following substances is used up during photosynthesis? Oxygen Sugar Sulfur dioxide Water

What is the role of mouth

Which atoms are found in all carbohydrates?