Vitamin D deficiency from lack of sunlight, look up the symptoms. Probably something along the lines of bone softening or bone decalcification. I know that's why it's added to milk which is high in calcium for healthy bones.
Sediment. So the river picks up sediment when it is moving quickly and deposits it when it slows down (or when there is a bend in the river).
Answer:
d. The ovaries receive blood from the ovarian and uterine arteries.
Explanation:
All the other options are correct except option D.
The ovary is only supplied with oxygenated blood from the ovarian arteries. The uterine arteries supply blood to the uterus alone.
First, let's talk about each cell stage:
G1 phase: (The longest phase) The cell is in its "normal" state of the cell, it does its normal metabolism and function. The cell grows up during this phase until reaching a point which let the cell pass to the S phase.
S phase: S for (DNA synthesis). During this phase, the cell replicates its DNA and check if there are no errors so it can pass to the next step of its cycle.
G2 phase: is the preparation for the M phase, it syntheses all the necessary proteins that participate in the mitosis.
and finally the M phase: (M for mitosis). This is the phase where the mitosis phases occur.
The cell needs a lot of preparation and checks in G1, S and G2 to do mitosis. especially in the G1 phase which is the longest phase. It is explained by the fact that the cell should "rest and recover" after the last mitosis before getting into the second one.