summative review 3

   An internal structure that supports the animal during                                                      development: becomes the backbone.

•    Nerve cord.

• Notochord.

•     Tail.

• Mouth.

Mammals are characterized by:

• Laying eggs only.

• Give birth only.

•     Most of them give birth but some lay eggs.

•    None.

Lancelets are ………………………….

• Vertebrate chordates

• Invertebrate chordates

• Mammals

• None of them

  Milky way is one of the ………………………………in the universe.

• Stars

• Galaxies

• Moon phases

• Comets

Salamander is covered with ………………………

• Hair

• moist Skin

• Exoskeleton

• None ofthem

They look like sponges in shape

• Lancelets

• Tunicates

• Jelly fish

• all of them

One of the characteristics of birds that they are

• Endothermic

• Ectothermic

• Both of them

• All of them