The gradual change in living communities that follows a disturbance is called?

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give