It takes 9 months for you to be born
C
Neurons and other components come together to form nerve tissue
The brain is formed of many different parts and types of tissues
The central nervous system runs through the body and consists of many parts
A human being has many different systems
Answer:
Populations have variation in traits due to random mutation, crossing over and environmental conditions.
Answer:
Metaphase I
Explanation:
Homologous chromosomes are paired to facilitate crossing over during prophase I of the meiosis I. This is followed by alignment of homologous chromosomes at the equator of the cell during metaphase I. The process is assisted by microtubules of spindle apparatus. The kinetochore microtubules of the spindle apparatus attach themselves to the kinetochores of chromosomes.
The two sister kinetochores of duplicated homologous chromosomes are attached to the opposite pole to align the homologous pair at the center of the cells. Metaphase I is followed by anaphase I during which homologous chromosomes move towards the opposite poles.
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