Answer: Meiosis; fertilization
In the human life cycle, diploid cells undergo a cell division process called meiosis. The resulting haploid cells later fuse during fertilization which regenerates diploid cells.
Explanation:
Diploid cells possess two basic sets of chromosomes known as homologous chromosomes. They undergo a two-step meiosis (Meiosis I and II) to yield four haploid cells with half the original chromosome number of the parent cell. These haploid cells are called sex cells or gametes.
The male and female gametes (sperm and egg) then fuses during fertilization to form zygote, a single cell with two sets of chromosomes (diploid number). Then, it undergoes mitosis to regenerates diploid cells with the same chromosome number as found in the zygote.
In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
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Circulatory system involves the heart organ, its function is to pump blood around the body.
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Answer:
Natural selection
Explanation:
Natural selection happens naturally, without the influence of humans. In this case, a scientist cross pollinated so it is not natural.
The enzymes decreases the activation energy. The activation energy is that minimum amount of energy, which is required to initiate a reaction. The enzyme catalyse the reaction by decreasing the activation energy of a particular reaction by catalysis. It acts as a catalyser by binding with the substrate molecule of reaction to decrease the activation energy.
