A slimy film discovered on medical equipment turns out to be a colony of complex, previously unknown, single-celled organisms that reproduce asexually and produce energy via organelles resembling chloroplasts. These cells are most likely to be classified as _____.
a. bacteria
b. prokaryotes
c. eukaryotes
d. vertebrates
c. eukaryotes
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Compact bone tissue is located in the area
indicated by a. A. b. B. c. C. d. D. e. E.
Which pair of hormones influences the urinary system’s ability to manage salt retention?
a. ADH and oxytocin b. aldosterone and cortisol c. thymosin and thyroxine d. insulin and glucagon e. aldosterone and ANP
The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of
A. natural selection. B. creation of new species. C. inheritance of acquired characteristics. D. genetic drift. E. increasing evolutionary resistance.
Which option incorrectly pairs a class of sensory receptor with one of the stimuli it detects?
A) electromagnetic receptors—light B) chemoreceptors—molecular structure C) mechanoreceptors—sound D) thermoreceptors—touch