The correct answer is option C
The stage of evolution represented by the middle finger must be imbibed by the letter ‘M’ in its name which depicts the “mutation”. In mutation a new gene is added to produce variation in the frequency. The other fingers depict the following stage of evolution:
a) Pointer finger depict the evolution caused by the movement of an individual or species into or out of the area. This finger represents gene flow.
b) The small finger represents the shrinking of population and thus represents the change in gene flow due to any mishappening or epidemic or calamity. This finger represent the small population
c) The ring finger represents the evolution caused by mating/sexual intercourse. This finger represent non random mating
d) The thumb represents the natural selection through adaption.
Heterocyst-forming cyanobacteria differentiate highly specialized cells to provide fixed nitrogen to the vegetative cells in a filament. In the presence of a source of combined nitrogen such as nitrate or ammonium, Anabaena PCC 7120 grows as long filaments containing hundreds of photosynthetic vegetative cells.
I think the first option is the answer.
Answer:
student 1
Explanation:
The smooth muscles contract and fatigue slowly but are not striated and are innervated by involuntary nervous system. The cardiac muscles are uninucleate and striated. The skeletal muscles are innervated by the voluntary nervous system hence concerned with voluntary movement.
Answer:
<em>This is an example of natural selection (adaptation).</em>
Explanation:
Natural selection tends to favor those organisms which are better adapted to live in an environment.
As tortoises having flat shell and long neck were better adapted to live in barren area, hence through natural selection those organisms were favored in such an ecosystem.
As tortoises that lived on the vegetative lands were more adapted to live in such an ecosystem, hence through natural ecosystem these organisms were favored and increased in numbers.
