Symbtoms of trisomy 18​

thin and frail babies with a weak cry.

feeding problems.

small head size with the back of the head prominent.

ears are usually low-set on the head.

mouth and jaw unusually small.

shortened sternum (breastbone)

about 90 percent of babies have heart defects.

clenched fists.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.