The five groups are fish, amphibians, reptiles, birds and mammals. In addition, we called these wild animals vertebrates, they have backbones.
Some of the characteristics they have to determine their group :
Fish : has slimy scales, use gills for breathing.
Amphibians: has moist skin, young ones use gills for breathing, older ones uses lungs and their skin.
Reptiles: has dry scales, internal fertilization and lay eggs.
Birds: has feather covering their body, has wings.
Mammals: has hair covering their body, uses lungs for gas exchange and has mammary glands for feeding the young.
Answer:
Explanation:
A( Gravity) because, When an object falls through space, towards Earth, it experiences positive acceleration due to the force of gravity. The acceleration due to gravity is 9.8m/s2.
The answer would be the chloroplast. The cell wall mainly covers and protects the cell's insides.