Tina is making a smoothie. First, she puts fruit in the blender. Then, she adds milk and some ice. Next, she turns on the blender to cut up and blend the ingredients. Tina now has a smoothie. Which of the following is the best description of her smoothie? A. a single substance B. a mixture of different substances C. three substances, but not a mixture D. both a single substance and a mixture

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements