How can mass extinction events be distinguished from background extinctions?

If a plant has 20 chromosomes, how many chromosomes would you expect to find in a pollen cell from that plant? Be sure to explain your thinking

The nasogastric tube will be inserted through the nose, travel through the pharynx and will ultimately end in the stomach. After passing through the pharynx, what long muscular passageway will the NG tube pass through to get to the stomach?

Which is the most common contamination source for freshwater

For each menu item at a fast food restaurant, fat content (in grams) and number of calories were recorded. A scatterplot of these data is given: Reference: Ref 4-3 A plausible value for the correlation between fat content and calories is A. + 0.2. B.

Primary succession would most likely occur after? a forest fire. a lava flow. farm land is abandoned. a severe storm.

During the digestion of foods, large molecules are broken down into smaller molecules

Identify each statement as a hypothesis, theory, or law. Higher air pressure causes fuel to burn at a faster rate.

Which sequence represents the correct levels of organization for multicellular organisms

Which statement best compares and contrasts lipids and carbohydrates? Both are used for tissues, but only carbohydrates are used for tissue growth. Both are used for energy storage, but only carbohydrates are used for long-term energy storage.

What is another name for lane d in the diagram