The Rocky Mountains formed 80 million to 55 million years ago during the Laramide orogeny, in which a number of plates began sliding underneath the North American plate. ... Since then, further tectonic activity and erosion by glaciers have sculpted the Rockies into dramatic peaks and valleys.
Most of the present physiographic regions of the Great Plains are a result of erosion in the last five million years. Widespread uplift to the west and in the Black Hills caused rivers draining these highlands to erode the landscape once again and the Great Plains were carved up.
Place the metric ruler across the zone of inhibition, at the widest diameter, and measure from one edge of the zone to the other edge. HOLDING THE PLATE UP TO THE LIGHT MIGHT HELP.
hope it helps...!!!
Answer:
ensemble of bound atoms or molecules that is intermediate in size between a molecule and a bulk solid.
Explanation:
Answer:
peppered moth- became darker because of pollution
darwins finches- beaks became smaller over time to eat the smaller nuts/seeds left
deer mice- became lighter being as their surroundings changed/ones that moved from forrests
Aseptic techniques are used to prevent the contamination of the media and culture from the microbes present in the environment. Another reason for using the aseptic techniques is to prevent the microorganisms in lab to spread in the environment or infect the person working with them.
Passing the open end of a broth tube or a bottle through the flame after opening it and before recapping it because the flame of the Bunsen burner creates a current in the form of convection current and this forces the air inside out of the tube. The air borne contaminants are also prevented from entering the tube. The heat of Bunsen burner increases the temperature around the working area thus reducing the chances of air borne contaminants to damage the cultures.
