I need help with this science question

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?