امتحان الكتروني -ساينس - الصف الرابع - الوحدة الاولى - الدرس الثاني

............is a process by which species change over many generations through mutation

The upper surfaces of the ....... of water lily plant are covered with wax.

Biological adaptations primarily include changes that  ........... in an environment.

Most plants can't overcome the drought, except .......

The shape and size of a bird's beak had changed from the parent to the offspring This change in the physical beak trait is called ...........

Acacia tree has ..........to reach deep underground water.

Savannah is found in ............, where the temperature is moderate.

............grows in rainforests of Amazon in Brazil .The height of these trees reaches to 70 metres.

Mangrove tree has a  special type of roots, called aerial roots.

Plants grow in all the places reached by the Sun, even at the bottom of iced marine surfaces.

Kapok tree has .................-shaped leaves.

........has short branches and thorns instead of leaves.

Organisms that cannot _____ will die off

Mutations over time and generations can improve ______.

Prickly pear has a lot of spines to ........