B. <span>The fossils in the lower layers are older than the fossils in the upper layers. </span>
Answer:
Outside factors are not always constant meaning that there is little way to control them.
Explanation:
Segregation. The Principle of Segregation describes how pairs of gene variants are separated into reproductive cells. <span>The segregation of gene variants, called alleles, and their corresponding traits was first observed by Gregor Mendel in 1865. Mendel was studying genetics by performing mating crosses in pea plants. He crossed two heterozygous pea plants, which means that each plant had two different alleles at a particular genetic position. He discovered that the traits in the offspring of his crosses did not always match the traits in the parental plants. This meant that the pair of alleles encoding the traits in each parental plant had separated or segregated from one another during the formation of the reproductive cells. From his data, Mendel formulated the Principle of Segregation. We now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.</span>
Answer:
Light is sn important element in the growth of a plant.
Explanation:
Light is an important factor influencing plant growth. It is a common observation that plants grow towards light. Charles Darwin and his son Francis Darwin first observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source (phototropism). After a series of experiments, it was concluded that the tip of coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile due to more growth on the dark side. That transmittable influence is now thought to be the phytohormone called auxin.
END of the answer.
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The answer is Surgical Contraceptive Methods e.g. Vasectomy(For males) and Tubectomy(Females)<span>.
</span>Vasectomy:- In this method vas deference is cutted and tied so that sperms can't reach uthera.
Tubectomy:- In this method both fallopian tubes are cut and tied, so that no egg can head towards the site of reproduction(
Cervix).
Note:- Both process are irreversible.
