I NEED HELP ASAP!! I will give 50points and brainliest PLS HELP ME During a third-trimester ultrasound, what would a doctor expect to observe in a fetus?
A. initial development of organs
B. response to noise and light
C. presence of a tail-like structure
D. the first heartbeat

B, the one in bold is the important aspect.

Explanation:

During  the third trimester of pregnancy the fetal ultrasound scan is performed with the help of the abdominal sensor within pregnancy weeks 34-36. At this stage of pregnancy the fetus has all vital organs fully developed and the period of fast growth and maturity continues. At this stage the fetus weighs 2400-2600 g and its length is 44-46 cm.

The fetus is already similar to a newborn infant as to the proportions of its body. It has bigger head compared to the body and thus most of them have already turned themselves upside down. It has developed mimic muscles of the face and it can smile. It opens its eyes. The connection has been created between the eye retina and brain and the child has a special glance in its eyes.

The pineal gland of the brain has started to produce a hormone called melatonin. Upon the impact of the hormone the fetus has developed its daily rhythm of life. Some fetuses are more active in the mornings, others in the evenings, but regardless of the latter the fetuses still sleep most of the time, i.e. 90-95% of the day.

The fetus has developed already all 5 senses at this stage of pregnancy

3.It breaths and swallows amniotic fluid by feeling its smell and taste

4.It has developed the skin tactile and pain sensitivity

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: