An investigation was performed to determine the effect of temperature on the activity of the enzyme catalase, which breaks down hydrogen peroxide releasing oxygen. Six test tubes containing enzyme and substrate were maintained at different temperatures. Observations made during the investigation were used to construct the data table below. An increase in the rate of bubbling in each of tubes 1 through 5 would most likely be noticed after * 1)increasing the temperature of each tube to 80°C
2)increasing the enzyme concentration in each tube
3)increasing the pH in each tube
4)decreasing the temperature of each tube to –10°C

What is one disadvantage of desalination? a - the process kills fish. b - the process uses fuel that is expensive. c - the process makes water that is unsafe to drink. d - the process is too difficult to carry out in big cities. quick taking a !

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.

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity