The best answer is :
It is designed to be thrown to someone in trouble.
Type IV PFD refers to the fourth<span> level of U.S.</span><span> Coast Guard's (USCG) classification </span>for private<span> flotation devices. </span>sort<span> IV PFDs are </span>carried<span> on boats as </span>a tool which will<span> be thrown to a drowning person. S</span>ort<span> 4 PFDs </span>also is referred to as<span> a throwable </span>float<span> or </span>sort four<span> PFD.</span>
Answer:
Explanation:
If you are having a question be sure to give options next time, just answered this question because it was there at khanacademy.org, if you want it with the options.... Well then, it's:-
Option 1: Because of his "Pact of Steel" with Hitler, he entered Italy into WWII with the Axis as soon as Britain and France declared war on Germany.
Option 2: He supported the Republicans against the Nationalist forces of Francisco Franco in the Spanish Civil War.
Answer:
Covering organs within trunk cavities
Lining trunk cavities
Explanation:
Serous membranes are layers of tissue that protect the organs. They prevent the organs from getting damage from friction which can occur as they rub against the cavity walls.
Serous membranes have two layers, the visceral layer and the parietal layer. The visceral layer covers the organs while the parietal layer covers or lines the cavity walls. In between these two layers, you will find a gap or cavity filled with serous fluid.
They cover organs like the heart, lungs, blood vessels (some of them at least), testes and other organs found in the abdominal cavity.
The best answer is B - Proteins.
Proteins make up enzymes, or to put it another way enzymes are made up of protein. It is enzymes that speed up the chemical reactions. Enzymes are organic catalysts, substances that speed up a (biochemical) reaction but do not take part in the reaction and remain unchanged at the end of the reaction.
In man, there are many enzymes. The majority of these are found in the digestive system where they greatly aid the process of food breakdown from complex molecules to simple molecules. Examples include salivary amylase found in saliva, which begins the gradual breaking down of starch into glucose right from the moment food is placed in the mouth and mixed with saliva. Pepsin in the stomach breaks down protein.
Answer:
Option C
Explanation:
The cyanobacteria is the oldest life form that once existed on planet earth some 3.7 billion years ago. These cyanobacteria formed layered structures fossils which are called as stromatolites
Hence, stromatolites are the fossilized colonies of cyanobacteria.
A set of rocks in Greenland show the evidence of cyanobacteria as a living organism.
These stromatolites have layered structure of bio-chemical accretionary that are produced by trapping sedimentary grains through biofilms of microorganisms such as cyanobacteria.
Hence, option C is correct
