Ptolemy's model had Earth at the center, and the moon's revolved around the planets instead of the planets revolving around the moon and sun. The planets' orbits' moved instead of the planets as well. Geocentric has Earth at the center and heliocentric has the Sun at the center
Answer:
Yes, they present everywhere in our environment.
Answer:
Genetic variation is caused by:
mutation
random mating between organisms
random fertilization
crossing over (or recombination) between
chromatids of homologous chromosomes during
meiosis
Answer:
<h2>Function as Waterproofing and works as a barrier to infection. </h2>
Explanation:
1. Keratinocytes are maintained at various stages of differentiation in the epidermis.
2. Keratinocytes are responsible for forming tight junctions with the nerves of the skin.
3. The outer layer of skin, the epidermis containing keratinocytes, which provides waterproofing and serves as a barrier to infection.
4. It is barrier to foreign particles and provide physical strength.
5. It helps in innate immune system.
