Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .

Ella Grasso, elected governor of Connecticut in 1974, supported the enactment (given, granted) of a freedom-of-information law.

Blue－green algae grow abundantly in salt marshes.

The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.

The first paper was made from the bark of the mulberry tree.

In 1861 it seemed inevitable that the Southern states would break away from the Union.

Some sea urchins海胆 have venomous (toxin) spines

The company issues an annual report every March.

Bats fly, rather than glide, and thus are the only mammals capable of true flight.

In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.