Answer to Question 1
Answer: Sentences can be described in terms of complexity of structure, with the number of clauses determining the complexity. The four types of sentences are simple, compound, complex, and compound-complex. Simple sentences have one independent clause with a subject and verb: The rat runs, or The rats and mice run and play. Compound sentences have two or more independent clauses joined by conjunctions or semicolons: The rats play, and the mice run away, or Rats play; mice run away. Complex sentences contain an independent or main clause joined with an independent or subordinate clause: Rats play when they encounter mice, or What mice do always attracts rats. Compound-complex sentences have at least two main clauses and two subordinate clauses: If you snap your fingers, the rats will play and the mice will run away.
Answer to Question 2
Answer: The purpose of writing has some bearing on how legible it should be. When writing for others, your handwriting needs to be more legible than when writing for yourself. Characteristics of legible handwriting include: letters written in the correct form, letters proportional to themselves in terms of size, letters spaced evenly apart within words and words space one letter apart from each other, and letters straight or slanted consistently, depending upon the handwriting form used.
Examples of heart rhythms: sinus bradycardia.
Structures of the respiratory system.
The major structures of the limbic system: amygdala, hippocampus, cingulate cortex, fornix, septum, ...
Diversity in hemoglobin structures
Two examples of a single crossover between two nonsister chromatids