Amule is the infertile offspring of a horse and a donkey mules have historically been used as mounts and beasts of burden,
especially in rough terrain such as mountains or the grand canyon. mules are generally stronger than either horses or donkeys,
can tolerate more extreme temperatures, have greater endurance, are longer-lived, and may require less food and water
there are places in america and other parts of the world where herds of wild horses live, well-adapted to the environment. if mules
are so much better adapted to harsh environments than either horses or donkeys, why have there never been populations of wild
mules?
a. because mules cannot reproduce
b. because mules are not natural
c. because mules are domesticated animals
d.
all of these

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip. nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule. true/false

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Why is it important to study each branch of earth science?