What is the significance of chitin in arthropods?

An ocean chain is shown below which organisms is a tertiary consumers

Can someone write me a small introduction about reflexes

What are the two problematic nutrients that runoff into the Chesapeake Bay? What are the sources of these nutrients?

The theory that earth's outer layer is broken into pieces that move slowly over earth's surface is known as convection True/False

Which feature on microscope did Anton van Leeuwenhoek add that enabled him to magnify organisms about 250 times? •drop of water •light from oil lamp •tubes that extend •polished lenses

How are babies made ... Asking for a friend

What is the symbol for calcium?

What is the genotype of the offspring missing on the first row of the punnett square? A.) lBlB B.) lAlB C.) lBlO D.) none of the above

Which of the following is the route by which water is transferred from cell to cell in the root section? A. apoplastic pathway b. transmembrane pathway c. symplastic pathway

Which substance requires sunlight for its synthesis?