Which of these is the correct explanation of mass change in developing eggs as illustrated in the graph?
A) A is the correct representation of mass change because as the baby bird develops inside the egg, it grows new parts.
B) B is the correct representation of mass change because the baby bird uses cellular respiration to fuel the biosynthesis of new parts and gives off mass as CO2.
C) C is the correct representation showing that nothing new comes into the egg and nothing leaves the egg, so it retains the same mass.
Answer: B
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Bilateral symmetry is characteristic of
a. cnidarians. b. sponges. c. jellyfish. d. flatworms. e. corals.
As plants invaded the land, all of the following were true EXCEPT
A. there was a greater availability of light for photosynthesis. B. there was an increased threat of desiccation of unprotected cells. C. there was an increased threat from predation by animals. D. there was a greater concentration of carbon dioxide available in the atmosphere.
Viruses that attack bacteria are called
A. lytic B. proviruses C. virulent D. phages
Juan has influenza and has aches, pains, and a fever. His mother, a physician, tells him to take an antipyretic. What is she telling him to take?
A. an antihistamine B. acetaminophen, like tylenol C. herbal tea with honey D. an antiviral drug, like tamiflu E. an antibiotic, like erythromycin