Grayson was doing his chores for his family. He was moving firewood from the truck bed to the woodpile. The distance between the truck bed and the woodpile is 43.7 meters. He hoped to finish his chores in half an hour because he wanted to go to the game with his friends. Grayson made seven round trips and finished after exactly 30 minutes. What was his average speed in meters per hours as he moved the firewood?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Common commercial benefits of microorganisms include synthesis ofa. insulin.b. antibiotics.c. aspirin.d. antibiotics and aspirin.e. antibiotics and insulin.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.