Answer:
C
Explanation:
surface tension occurs when there is attraction between water molecules
Answer:A blood: 25% B blood: 25% AB blood: 50% O blood: 0%
Explanation:
Answer:
True
Explanation:
Most cells are specialised to perform particular functions, such as red blood cells? that carry oxygen around our bodies in the blood, but they are unable to divide. Stem cells provide new cells for the body as it grows, and replace specialised cells that are damaged or lost.
We'll use humans as an example since it's simple and relevant.
All
healthy humans have 46 chromosomes (23 pairs of very similar
chromosomes). When gametes are formed in meiosis, this number is halved,
such that sperm and ovum have only 23 chromosomes (just one of each
pair). When these gametes meet and fuse as a result of sexual
reproduction, the 23 chromosomes from the ovum and the 23 chromosomes
from the sperm combine to form the full set of 46.
Sometimes
meiosis doesn't quite work perfectly, though. Downs Syndrome is an
example of this (one gamete has both copies of chromosome 21, so after
fusion with the other gamete there are 3 chromosome 21s!).
