Which of the following is the least successful method
of birth control?
a. early withdrawal
b. a condom alone
c. a spermicidal jelly or foam alone
d. douching
e. the Pill
Answer: d
You might also like to view...
In the logistic model of population growth, what is expected to happen to r when N = K?
a. r will approach rmax b. r will approach 1 c. r becomes negative d. r = 0 e. r > 0
Most of today's animal phyla appear in the fossil record within a short span of 25 million years beginning about 530 MYA. When researchers analyzed the DNA evidence that might relate sponges to the modern phyla, what unexpected result did they find?
A. Many development genes thought to be specific to eumetazoans were found in sponges. B. The entire genome of sponges was found to be very different in gene diversity from the genomes of other phyla. C. Samples of the living sponge Oscarella carmela were found to be relatively unchanged from fossil sponge DNA samples. D. Most of the developmental genes found in eumetazoans are absent in the sponge Oscarella carmela. E. All of the answer choices are correct.
What is true about dissimilar organisms such as a cow and yeast?
a. they are not related at all b. their degree of relatedness cannot be evaluated c. their degree of relatedness can be determined from their genes d. they can interbreed and thus are the same species
Skeletal muscle cells are not typical cells because ____.
A. groups of them fuse in the embryo to form multinucleated fibers B. they are smooth C. they are hydrostatic D. they do not respond to stimuli E. they operate independently from all other body systems