The answer is D. 4 because its after perception
The answer is a haemoccult test. This test involves laboratory testing of three consecutive stool samples for the presence of blood which is invisible to the eye (occult blood). Presence of blood in the stool, however, does not necessarily mean that a person has colorectal cancer.
I really don't know but I know that its part of your body
Explanation:
As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere. After about half a billion years, Earth's surface cooled and solidified enough for water to collect on it.
Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things. We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbes.
