Which of the following statements is false?     a. two or more atoms combine chemically to form a molecule.   b. two or more different atoms combine chemically to form an element.   c. two or more different substances combine physically to form a mixture.    d. two or more elements combine chemically to form a compound.

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

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?

Identify the structure in organisms that do not have kidneys that is adapted to regulate water balance