A what mutation occurs when a base in the DNA sequence is replaced by a different base

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?