changes in environments

Lamarck suggested that new needs arise in the organisms as the ever-changing environment influences them. Changes in the environment create a new need in the organism for adapting to that change, failing which the organism cannot surviv..

No chance for combinations, so no variation in the population. Individuals may not be able to adapt to changing environment. It generally leads to overcrowding and a struggle for existence..

The first photosynthetic organism probably appeared almost three billion years ago. With the evolution of photosynthesis, however, organisms began to change the face of our planet and, as a consequence, to exert strong influences on each other. Organisms have continued to chang..

Personal health Characteristics and changes in populations Types of resources Changes in environments Science and technology in local challenge..

Variation could arise through a process of hybridisation, sometimes even in interspecific hybrids. Genetic variability is necessary for a species to increase its chances of survival. The environment is constantly undergoing changes due to geological and biological processes. He..

a) Neither can good qualities be introduced nor can bad characters be eliminated. b) Subsequent generations show a general fall in vigour and vitality. c) Adaptability, to changed environment decreases due to the absence of variations. d) Overcrowding and severe competition amon..

It controls and coordinates all the activities of the muscles in response to the changes outside. It also maintains the internal environment of the body by coordinating the functions of the various internal organs and the involuntary muscle..

In healthy individuals, the ECG remains reasonably constant, even though the heart rate changes with the demands of the body. The electrical activity of the heart shows changes under the following situations. a) Change in ionic environment of the heart b) A d..

Animals are different from plants because of their ability of locomotion. This ability probably developed as they have to search for food, unlike the plants that are autotrophic. Since they move from place to place, the animals have to continuously encounter changes in their en..

Introduction - Animals are different from plants because of their ability of locomotion. This ability probably developed as they have to search for food, unlike the plants that are autotrophic. Since they move from place to place, the animals have to continuously encounter changes in thei..