Present & past passive + comp&sup adj

The periodic table ____________ (develop) by Dmitri Mendeleev in 1869.

Experiments __________(conduct) to study chemical reactions.

New species ___________(discover) by biologists each year.

Vaccines are developed to protect against diseases.

• are developing

• developed

• are developed

• are developped

Present simple passive is generally used to describe:

• A process

• An invention

• A discovery

• about how one thing received the action of another thing

Weather patterns ___________ to predict storms and hurricanes.

The laws of motion ____________(formulate) by Isaac Newton in the 17th century.

Solar energy is one of the ______ sustainable sources of power.

The smartphone is ________ efficient than traditional telephones.

The telescope is one of the ________(great) tools ever invented for exploring the universe.