How do scientist develop scientific explanations about subjects that are impossible to study through controlled experiments?

Which of the following would be an individual's most important contribution to limiting the spread of illness? Frequent hand washing Regular exercise and intake of vitamins Avoiding crowds and public places Visting the doctor regularly

Today, the fayum of egypt is a desert. oligocene deposits have produced numerous fossil primates. the paleoenvironmental evidence suggests that during the oligocene the fayum was a:

Which is not one of the soil texture components of soil established by the US department of agriculture? A. Loam B. Silt C. Clay D. Sand

Is bacteria bigger than viroids?

In which type of wave does direction of the disturbance and the direction of the wave motion travel perpendicular to one another

Cross a homozygous dominant individual for brown hair with an individual who is blond hair. remember the starting are the parental generation. What you are getting with results are the offspring (the F1 generation)

Identical twins look alike because their bodies contain identical

You can spread allergies to another person t/f

A volcanic eruption adds carbon dioxide to the air. This is an example of interactions between the 1) hydrosphere and geosphere 2) atmosphere and geosphere 3) geosphere and biosphere 4) hydrosphere and biosphere

A 16 year old highschool student presents in the ER with a fever, stiff neck, headache and nausea. You order a spinal tap to be performed. Gram staining of the CSF reveals Gram (-) rods under the microscope.