Number 2 is B the sea level rising
Number 3 is C the lightbulb
Number 4 is D carbon dioxide
Primary succession is much slower than secondary succession because it begins where there is no soil. It can take several hundred to several thousand years to produce fertile soil naturally. The first pioneer species to colonize the bare rock will probably be bacteria and lichens, which can live without the soil.
Answer:
Segregation.
Explanation:
The Mendel had worked on the pea plant and known as as the father of genetics. Mendel had explained the law of genetics that contains law of segregation, law of independent assortment and the concept of dominance.
The law of segregation states that at the time of formation of gametes, each allele may get separate or segregate from the pairs of alleles and unite to form the zygote. This includes the monohybrid cross. The phenotypic ration of monohybrid cross is 3:1 that explains the law of segregation.
Thus, the correct answer is option (A).
Answer: 1)Spiral galaxies are a class of galaxies originally described by astronomer Edwin Hubble in his 1936 work The Realm of the Nebulae.
2) They are part of the Hubble sequence a morphological classification scheme for galaxies.
3) Spiral galaxies usually consist of a rotating disk that contains stars, dust, gas, and a concentration of stars known as the bulge in the center.
4) These bulges are often surrounded by a faint halo of stars, many of which reside in globular clusters – a spherical collection of stars that orbits a galactic core.
5) As such, Spiral galaxies are named after their spiral structures that extend from the center into a galactic disk.
6) They have spiral arms – sites of ongoing star formation that are brighter than the surrounding disk due to the presence of young OB stars that inhabit them.
Explanation:
