Dna is made of two chains of nucleotides. which type of bonds hold the chains together? hydrogen bonds covalent bonds ionic bonds polar covalent bonds

Select the correct answer from each drop-down menu proteins are

All phases of matter may have a fixed mass

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!