An explanation for an event based on observation and experimentation is called

a) law

b) hypothesis

c) variable

d) theory

How does mitosis in plant cells differ from that in animal cells? A. Plant cells lack spindle fibers. B. Plant cells lack centrosomes. C. Animal cells lack cytokinesis. D. Animal cells lack a cell plate.

Mountain ranges often appear on the edges of continents. What theory does this support? Mountains were formed when Earth's crust cooled and Earth shrank. Mountain ranges were formed when continents collided.

Which process is not associated with mechanical weathering?

This simple bacteria cell has the same structure as more complex cells. It controls what comes in to and leaves the cell and also maintains homeostasis. It is the

When a volcano erupts, it results in dangerous lava and mud flows, and the ash it produces can travel hundreds of miles.

Colleen has been advised by her physician to avoid taking high-dose supplements of certain vitamins because they can accumulate to toxic levels in her body. which vitamins?

In 1865, a biologist, St. George Jackson Mivart, constructed an evolutionary tree of existing primate species with many branches based on analysis of spinal columns. But to his dismay, another tree based on limb comparison was quite different.

How does the amount of rainfall affect the amount and types of seeds present on the Galapagos Islands?

If a characteristic is found in bacteria, fungi, pine trees, snakes, and humans, when did it most likely evolve?

Which property allows objects that do not produce their own light to be seen