Topic 5 - How do we explain prehistoric times?

To become hard or firm.

An animal with a hard skeleton on the outside of its body.

When two past actions happen at the same time, we use the past continuous for the .......... action.

When two past actions happen at the same time, we use the past simple for the ............ action.

Is it true the following statement? We connect two actions that happen at the same time with WHEN before the past continuous.

One of the small hard flat pieces of skin on the body of a fish, snake or similar animal:...

Tiny living things that you can only see under a microscope.

These animals lived millions of years ago but are now extinct.

A scientist who studies fossils of prehistoric plants and animals:

An animal thet eats both plants and meat: ....

The lower part of your face that includes your chin and your bottom teeth.

A large monkey without a tail that can stand nearly straight and walk on two feet.

One of the long curved bones that are in your chest.

To say something suddenly without thinking:...

An animal that eats other animals:...