Plasmodium, the world’s most lethal parasite, causes malaria. the parasite enters the
bloodstream through a mosquito bite, hiding in the human liver before invading red blood
cells. ultimately, millions of infected blood cells explode at once, causing fever and death
in 3 million people a year worldwide.
source: zimmer, february 12, 2001, “animal parasites – as gross as it gets,”
“science world,” pg 11.
-- state one reason why plasmodium is considered a parasite of humans. [1]
-- state one negative impact on humans when the use of pesticides for mosquitoes is decreased. [1]
-- if a large quantity of herbicide, a chemical that is designed to kill weeds, were accidentally spilled into
a large lake, it could endanger all the organisms living in the lake. state one way the effects of killing
the weeds in the lake could be destructive to populations of fish and other animals.

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.

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?