What type of mutation results in a base pair within a dna sequence being replaced with a different pair?

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

How does food concentration affect yeast activity

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?