A DNA sequence is shown.

AAT - CCG - GTG

Which sequence best shows the result of a substitution mutation in the DNA?

A. AAT - CCG - GTG

b. AAT - CCA - GTG

c. ACA - TCC - GGT - G

d. AAT - CAC - AGT - G

Dona wrote the characteristics of two types of galaxies as shown below: type a: has a large flattened core type b: does not have a regular shape which statement is correct? type a is an irregular galaxy and type b is a lens galaxy. type a is a lens galaxy and type b is an irregular galaxy. type a is a spiral galaxy and type b is an elliptical galaxy. type a is an elliptical galaxy and type b is a spiral galaxy.