Apatient visits your clinic often with recurrent respiratory infections. based upon their medical history, it appears they have been an active smoker for over 40 years. select the statement that most accurately reflects how this information may reveal why the patient is highly susceptible to respiratory pathogens:

1. smoking decreases the formation and effectiveness of complement proteins.
2. smoking can paralyze the ciliary escalator.
3. smoking directly inhibits b- and t-cell action.
4. smoking decreases the activity of neutrophils.

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

9. the history of life on earth is recorded in