____ are examples of trace fossils.
A. Skeletons
B. Shells
C. Seeds
D. Footprints
E. Leaves
Answer: D
You might also like to view...
The dizzy feeling you encounter when you sit up is being activated by the
A. thermoreceptor in your ear lobe. B. photoreceptor in the skin. C. mechanoreceptor in the vestibular apparatus. D. proprioceptor in the cochlea. E. chemoreceptor in the ear drum.
The placenta
a. forms from endometrial and extraembryonic tissues. b. will cover about one-fourth of the inner uterine surface at full term. c. does not normally intermingle fetal blood with maternal blood. d. secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. e. does all of these.
What prompts a newborn baby to start to breathe?
A) an increase in the concentration of carbon dioxide in the baby's blood B) a decrease in the concentration of oxygen in the baby's blood C) a change in the temperature on the surface of the skin D) exposure to air
All of the following are advantages of attenuated vaccines over inactivated vaccines exceptÂ
A. they confer longer lasting protection. B. they require fewer boosters. C. they can be transmitted to other people. D. they require smaller doses. E. they produce infection but not disease.