Answer:
The conditions for natural selection are:
- overproduction of offspring
- variation among organisms in a population
- favorable adaptations selected by nature
Explanation:
- Natural selection is the continuous process of reproduction and survival that is caused by the contrast and differences due to phenotype.
- Overproduction of species creates the competition and only the one survived through the natural selection grows to the next generation.
- Similarly variations in the phenotypic organization of species, their adaptation process etc causes the natural selection.
- Natural selection is the gateway for the evolution.
Answer:
77.5 years
Explanation:
Preliminary data indicates that life expectancy at birth in the United States had reached a record high in 2003.
Answer: The color of the moths will become light.
Explanation:
Due to industrial exposure of smoke and dust the white color moths adapted a phenotypic trait of dark brown feather color which used to mimic the color of the tree trunk so the moth population was able to camouflage the predatory birds as these moths remain undetected. But due to reduction in pollution the tree trunk color regain its lighter color and these dark colored moths were detected by the predators so the dark color moth population decline and the white color of feather became the phenotypic trait passed in the next generation enabling the moth population to survive in reduce pollution conditions.
The majority of nitrogen is fixed by bacteria most which are symbiotic with plants recently fixed ammonia is then converted to biologically useful forms by specialized bacteria.
