Epithelial cells are mainly used for protection; in the urinary tract, these tissue cells are used to protect the bladder from toxic urine. The tissue can also expand to hold larger quantities of urine.
Answer:The image to this question is attached.
Answer is the ovary
Explanation: the process by which egg is produced is called oogenesis. It involves the mitotic division of the primodial germ cells to from a oogonia. The oogonia becomes enveloped by follicle cells . Oogonia grows to become the primary oocyte. Each primary oocyte is diploid. It then undergoes the first meiotic division to form the secondary oogonia and a smaller polar nody. all this process of development occurs in the ovary.
After it is released from the ovary, fertilization occurs and it undergoes the second meiotic division to from a polar body and an ovum.
The primary oocyte however remains in prophase of meiosis l throughout childhood.
Answer: Option B) directly through the lipid bilayer.
Explanation:
Since membrane are made up of a phospholipid bilayer, with hydrophobic heads and hydrophilic tails, it permits the movement of nonpolar (organic) molecules to diffuse through it into the biological membrane. This is because they are lipophilic (lipid-loving) substances.
Examples of molecules that passed directly through the lipid bilayer are pollutants such as poly-aromatic hydrocarbons, benzopyrene etc.