Which statement about Kepler's work is FALSE? He proposed two laws of planetary motion
He used mathematics to support his work
He described that the orbits of planets are not perfect circles
He described that the Earth is not always the same distance from the sun

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.

Compare and contrast physical changes with chemical changes.

What does the symbol (–hfus) indicate in a phase change?