Which substance can be broken down by chemical means?
(1) magnesium (3) mercury
(2) manganese (4) carbon dioxide

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at