Animal Reproduction

Which types of organism does external fertilization occur most often?

• mammals

• reptiles

• birds

• amphibians

Mammals have

• internal fertilization

• external fertilization

Most mammals are ________

• monotremes

• marsupials

• placental

The _________ is the main organ of the respiratory system.

• heart

• lung

• esphogus

• kidney

Egg-laying mammals are called

• marsupials

• monotremes

• placentals

• birds

Most mammals are marsupials

• true

• false

The gestation period is the time an embryo spends in the egg

• true

• false

humans are placental mammals

• true

• false

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

The system that filters liquid waste through the kidneys is the ____

• excretory

• respiratory

• circulatory

• digestive

Birds are egg laying mammals

• true

• false