The oldest definitive trace of flowering plants in the fossil record consists of:
a. petals and sepals.
b. primitive embryo sacs.
c. pollen grains in an anther.
d. pistils on vegetative stems.
e. ovules enclosed in podlike fruits.
e
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Euglenoids live in freshwater; a __________ rids them of excess water. Fill in the blank(s) with the appropriate word(s)
What happens when a resting neuron's membrane depolarizes?
A) There is a net diffusion of Na+ out of the cell. B) The equilibrium potential for K+ (EK) becomes more positive. C) The neuron's membrane voltage becomes more positive. D) The neuron is less likely to generate an action potential. E) The cell's inside is more negative than the outside.
The medullary cavity is located in the epiphysis of a bone.
Indicate whether the statement is true or false
The work of Lister, Nightingale, and Semmelweis all contributed to controlling infectious disease by
A) developing techniques for isolating pathogens. B) developing methods for reducing healthcare-associated infections (HAIs). C) identifying the sources of infectious agents. D) determining the taxonomic relationships among microbes. E) developing vaccines.