Justin is making a snack. he toasts a piece of bread and spreads peanut butter and jelly on it. then he cuts an apple into several slices and adds these to his plate. next, justin mixes a scoop of lemonade powder into a glass of water, mixes it, and adds ice. how many chemical changes occurred in this scenario? one two three four

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.

Acommon kind of mechanical weathering is called

Pulmonary arteries carry highly oxygenated blood. true or false?