Question

use the text to compare and contrast natural glue and synthetic glue.
for centuries, people used animal or plant parts to make glue. this glue is called natural glue since its ingredients come from nature. by the 1950s, however, people started using synthetic, or human - made, chemicals to make glue. synthetic glues have many advantages over natural glues. for one thing, natural glues can take a while to dry, whereas synthetic glues usually dry quickly. unlike natural glues, which can often be washed off with water, most synthetic glues cannot be easily washed off. and while natural glues get weaker with age, synthetic glues usually stay strong. its no wonder most glues are synthetic these days!

Explanation:

According to the text, "natural glues can take a while to dry" so "Takes a long time to dry" applies to natural glue. "Unlike natural glues, which can often be washed off with water, most synthetic glues cannot be easily washed off" means "Hard to wash off" is for synthetic glue. "While natural glues get weaker with age, synthetic glues usually stay strong" shows "Gets weaker with age" is for natural glue.

Answer:

• Takes a long time to dry: Natural glue
• Hard to wash off: Synthetic glue
• Gets weaker with age: Natural glue