Down syndrome is a genetic disorder that is typically caused by an extra copy of chromosome 21 in a person's genome. in a small number of cases, however, down syndrome occurs because a section of chromosome 21 becomes fused onto another chromosome. the type of down syndrome that occurs because a section of chromosome 21 attaches to another chromosome is an example of a genetic disorder caused by a. a frame shift mutation. b. chromosome deletion. c. a recessive allele. d. chromosome translocation.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

about 40,000,000 results (0.81 seconds)  

search results

what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.