When do scientists consider a hypothesis valid?

A.

when the hypothesis is testable

B.

when the hypothesis is published in a scientific journal

C.

when more than one person supports the hypothesis

D.

when experimentation shows it to be true

Which can best describe the fossil record

What is the characteristic of a cell

True or False: there are phenology changes occurring earlier in the spring than 50 years ago? A. True B. False

Hereditary monarchies, whereby the crown passes down through a single family, are examples of:

A chemical is spilled in a grassy area. the chemical has been known to kill all bacteria that live in the soil. how will this most likely affect the area?

Hank has a very detailed model of the solar system where each planet is made out of granite rock. Since his little sister really liked the model, he spent two weeks in his dad's workshop building her a Styrofoam copy.

Match each theory with the correct description 1 big bang theory 2. inflation theory There was no initial explosion. The universe has always been and continues to be as it is now.

How are all living thing made of cells

Which is am example of an internal stimulus? A) an increase in the amount of water available to a plant B) an artificial light attracts insects C) a decrease in oxygen levels in the blood during exercise D) a sudden change of air temperature

How dose one determine when an ecosystem is in balance