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

a) law

b) hypothesis

c) variable

d) theory

Explain deforestation, desertification, and urbanization.

If cells are grown in a medium containing radioactive 32P-labeled phosphate, which of these molecules will be labeled? A. amino acids B. nucleic acids C. glucose D. proteins

How long ago are prokaryotes belived to have evolved on earth?

Harrison wanted to find out what soil works best for growing roses. He grew them in potting soil, clay, sand, and soil he found outside his yard. After one week, he measured their height and how many leaves they had.

The water cycle would not occur if what was missing?

A mother is fertile but unable to conceive. an egg taken from the mother and sperm from the father are combined in a laboratory. the embryo is then placed in the mother's uterus. what is this called?

Which of the following is the correct definition of radiant energy? A. energy that is transmitted in the form of electromagnetic waves B. energy created by sound waves C. energy an object has because of its motion or position D.

How many chromosomes do we get from each parent?

As sales tax is s type of

Which foods should be minimized in the diet of an athlete managing gastroesophageal reflux disease (GERD) ?