Earth formed 4.6 billion years ago, and it wasn't until approximately 3.5 billion years ago that we estimate the first prokaryotic unicellular organism existed. The first eukaryote organism probably evolved 2 billion years ago, with the first multicellular organisms evolving about 1 billion years ago.
If 1 centimeter (cm) represents 10 million years (mya), then the 4.6 billion years of the existence of Earth would represent 4.6 meters (m), with the 4.6 m mark being the present.
This means that if we made a timeline with these dimensions, the origin of life would be at the 1.1 meters (110 cm) mark, the eukaryotic life forms appearing at the 2.6 m mark, and the first multicellular organisms around the 3.6 m mark.
Palisade cells are found in the mesophyll of a leaf and their main function is the absorption of light so that photosynthesis can take place. The palisade mesophyll consists of chloroplasts with chlorophyll that absorb the light energy. The mesophyll layer is made up of the palisade cell and spongy parts.
<span>B. Social learning theory
Behaviorism is a popular view in psychology concerning behavior and responses is said to be shaped by one's environment.
One component of behaviorism is social learning theory which suggests that </span>"behavior changes as a result of observing people in various
<span>
situations".</span>
There are other two views:
1. Classical conditioning
2. Operant conditioning