Tag: natural selection

Natural selection is the process where organism with favorable traits are more likely to reproduce. In doing so, they pass on these traits to the next generation. Over time this process allows organism to adapt to their environment.

For the purpose of avoiding being noticed and to save itself successfully from the snake, the prey becomes motionless. It ambushes itself well with the surroundings. The ambush may be set by hiding in a burrow, by camouflage, by aggressive mimicry, or by the use of a trap.

• Instinct behaviors are innate abilities. They occur and are present from birth onward and are not learned behaviors. It is performed by all members of their species. They are typically a fixed action pattern (FAP) that occurs as a result of a specific stimulus. For example, spinning a web by a spider, nest building and other maternal activities, migration patterns of animals, social behavior in pack animals, swimming by fish, etc.
• Hence, fish do not need to learn how to swim is an example of instinct behavior.

The action does not involve the brain and is an example of a simple reflex. When the leg of the frog is pinched, the stimulus is received by receptors on the skin that set up a sensory impulse. This impulse is carried to the spinal cord through the dorsal sensory root of a spinal nerve. The spinal cord then transforms the sensory impulse into a motor impulse. This impulse is then transmitted to the leg muscles. The muscles on receiving the impulse contract and the leg is withdrawn to avoid the stimulus. So, the correct option is 'simple reflex'.