Spiny echidnas are unlike other mammals in that they:a
have endothermy.
b. do not have two pairs of temporal openings in the skull.
c. have mammary glands.
d. have hair.
e. do not have nipples.
e
You might also like to view...
When did the first plants evolved from algae?
A. 4.7 billion years ago B. 470 million years ago C. 470 thousand years ago D. We do not know exactly when the first plants evolved from algae.
What is the term for a large-scale terrestrial
ecosystem with a unique climate and vegetation?
a. biosphere b. ecosystem c. trophic level d. biome e. community
Which of the following is true regarding the use of osmotic pressure as an antimicrobial agent?
A. Exposing organisms to the air on a benchtop so they completely dry out is an example of using osmotic pressure as a means of microbial control. B. Exposing a microbe to a hypertonic environment draws water out of the cell, causing plasmolysis. C. Salts and sugars external to a microbe create a hypotonic environment, which causes lysis of the cell. D. Salt is an effective solute to create an osmotic pressure gradient outside of a cell; however, the use of sugar, such as in jams and jellies, works via a different mechanism.
A monocular microscope uses a beam of light that usually passes through two lenses. The two lenses limit the total magnification of the specimen being observed. Suppose one lens magnifies an image 10 times (10x), and the magnifying power of the three others lenses are 10x, 20x, and 40x, respectively. What is the highest magnification of a specimen that can be seen with this microscope?
A) 10x B) 30x C) 400x D) 200x