Coral reefs are faced with many threats. some, like the crown-of-thorns starfish and sea urchins, are considered natural threats and some, like warming water temperatures and pollution, are considered man-made threats. do you feel that natural or man-made threats pose the biggest risk to the survival of coral reefs? why? what do you feel is a solution to the threat?

Study the diagram of a desert food chain . what would most likely happen if the kangaroo rats were killed off and removed from the food chain ?

Four different thermometers were used to measure the temperature of a sample of pure boiling water. the measurements are recorded in the table below. thermometer temperature reading 1 temperature reading 2 temperature reading 3 w 100.1°c 99.9°c 96.9°c x 100.4°c 102.3°c 101.4°c y 90.0°c 95.2°c 98.6°c z 90.8°c 90.6°c 90.7°c the actual boiling point of pure water is 100.0°c. what can be concluded from the data about the reliability and validity of the thermometers?

Explain how light energy is turned into chemical energy? ! due tomorrow!