Sand is made of different types of rocks shapes and sizes of rocks are not all the same sand is a ?

sand is a substance: because is a mixture of two or more material which are not completely comband tougher but are phsicla comband tougher

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.