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☆☆☆☆☆bikateral symmetry
Birds have a number of traits that make them lighter, an adaptation for flight. The mait trait that makes birds lighter is that their bones are hollow.
A . Phototropism is directional growth in which the direction of growth is determined by the direction of the light source. (www.wifi.tk)
the Muslims aggressively carried the message of Muhammad to other people
An example of a behavior that is 'inborn' and does not not have to be learned is instinct. Instincts are inborn patterns of activity or tendencies to actions common to specific biological species.
yes
It means "spiny skin."
perrenials
Kangaroos, and most marsupials, carry their offspring in a pouch. The correct term for the pouch is marsupium.
The phylum arthropoda takes its name from the Greek for "jointed foot" or jointed leg; arthropods are characterized by their jointed appendages.
The mandibles of arthropods open side to side. The jaws of humans open up and down.
Seasonal changes are changes between the seasons.
yes
Mouth and nose, the trachea, the branching tubes, the bronchi, and finally the air sacs (alveoli)
Three that are more familiar are leeches, tapeworms and flukes.
