1. When do pioneer species arrive during primary succession? A. Last ones to appear in an ecosystem with no soil present
B. First ones to appear in an ecosystem with no soil present
C. Appear in an ecosystem during the middle of primary succession
D. Appear in an ecosystem during the middle of secondary succession

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

answer; motor (efferent)neurons;