simple epithelial tissue

chitin

Subject:

a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...

teeth

Subject:

small structures found in the jaw that are used for biting and chewing food.

Subject:

(also called radioactive dating) a method of measuring the age of fossils based on how much...

Subject:

a blood glucose level that is above safe limits.

Subject:

the parts and processes of the body that recognise and fight pathogens, such as viruses and...

X-Kit Achieve!