Fossil fuels formed before the age of the dinosaurs. Some formed from ancient plants and organisms. These plants and

organisms turned into a spongy material called

clay

mulch

peat

sand

In an experiment, what is the factor that is tested?

Fast-moving glaciers that can move up to 6 kilometers per year

Which type of change was seen in the ecosystems affected by the 1988 fires in Yellowstone park

What are some practical issues associated with planning and conducting research?

Which factors are used to differentiate climate regions? Check all that apply. rainfall plant life animal life temperature wind

What is an abiotic factor that can be found in a rain forest ecosystem

Explain Why, in winter, most of the meltwater produced by salting the roads will not infiltrate the soil

Which processes are directly responsible for the presence of the different species of wheat and corn shown in the diagram above?

Which diseases are caused by viral infection? Anthrax West Nile Measles Hepatitis A Chicken Pox Tetanus Rabies Bubonic Plague Influenza (flu) Hepatitis B Mononucleosis Gonorrhea Lyme Disease Cholera Whopping Cough Common Cold

Which of the following is not true regarding the formation of a dipeptide? A. a molecule of water is produced B. two amino acids are joined together C. a double bond forms between carbon and nitrogen D. a protein is formed