Soil is classified by particle size into one of three different categories: sand, silt, or clay. the diagram shows a comparison of these three particles, as well as a piece of gravel to show size differences. which best explains why all soil particles are not the same size?

Describe pasteur’s results and how they disprove spontaneous generation.

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity