The most recent and arguably best-known, the Cretaceous–Paleogene extinction event, which occurred approximately 66 Ma (million years ago), was a large-scale mass extinction of animal and plant species in a geologically short period of time.
Answer:
The options
A. inear perspective
B. texture gradient
C. motion parallax
D.perceptual constancy
The CORRECT ANSWER IS D.
D.perceptual constancy
Explanation:
Perceptual constancy, is also know as Object Constancy, or Constancy Phenomenon. It is the ability of the brain to view perception of objects not minding the variations in retinal image when an object adjusts position or distance from the viewer. It helps animals and humans to view familiar objects as possessing standard shape, size, colour, or location irrespective of variations in the angle of perspective, distance, or lighting despite the fact that the illumination and retinal images may vary.
Another example is the distance between a door and an individual such that no matter the distance between a door and a person, the person still perceive it as possessing a constant size.
The correct option is this: PIONEER ORGANISMS MOVE INTO NEW COMMUNITIES FIRST.
Ecological succession refers to the process of change that occur to the species in a given community over a period of time. Succession is caused by change in the environment and its effects on the living organisms that are living there. There are two basic type of ecological succession, these are primary and secondary ecological succession.
Primary ecological succession typically occur in an environment that is devoid of any form of vegetation or life form; it is usually a bare land that lack soils that are needed for plants' growth. The first set of plant that grow in this kind of environment are called pioneer species. Such plant usually have ability to survive in harsh environment. Example of such plant is ferns. Primary succession is very slow and can take hundreds of years.
Secondary succession usually occur as a result of an event which reduce an established ecosystem into a smaller population. The event could be a forest fire, flooding, etc. Secondary succession takes place in an environment in which some living organisms are still existing. The process is fast compared to primary succession.
A hawk is a primary consumer
