Question

use the text to compare and contrast synthetic glue and natural 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!
synthetic glue natural glue
takes a long time to dry
hard to wash off
gets weaker with age

Explanation:

The text states that natural glues take a while to dry, can often be washed off with water, and get weaker with age. Synthetic glues usually dry quickly, are hard to wash off, and usually stay strong.

Answer:

Takes a long time to dry: Synthetic glue - □, Natural glue - ■
Hard to wash off: Synthetic glue - ■, Natural glue - □
Gets weaker with age: Synthetic glue - □, Natural glue - ■