Lichens are often the first species to colonize an environment during primary succession. In general, the first species to colonize an environment is called i need he

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

c. establishing proper sleep hygiene

d. organisms have cells with different shapes and functions.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.