When you are focusing an object under the microscope, explain why some parts are in focus and some parts are out of focus?

Your basic lens is the pinhole camera. You can illustrate a picture to exemplify how the light rays bypass through the hole to outline a picture on the screen. A lens is a development on the pinhole, but the pinhole result is still there, defined by the width of the lens. In a camera, the width is adjustable and that is what the f-stop embodies. A small f-stop means a small hole and the pinhole effect permits focus in a large range. A large f-stop means the focus has to be more accurate, and things in front or behind the focus point are blurred. In a microscope you have no such adjustment, so depth of focus is always the same meaning that some objects in front of and behind the object being viewed will also come into view in focus.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.