Answer:
It is a compound sentence.
Explanation:
Compound sentence contains two independent clauses.
gas exchange is a primary example of simple diffusion,the exchange of *oxygen* and *carbon dioxide* fuels the cellular processes such as photosynthesis and cellular respiration
Not enough ..................
Answer:
The tissues of multicellular, complex animals are four primary types: epithelial, connective, muscle, and nervous. Recall that tissues are groups of similar cells group of similar cells carrying out related functions.
Explanation:
.
The relationship between annual earnings and education attainment is the higher the education level , the higher the income .