Correct answer only if you know
a scientist studying fossils in undisturbed layers of rock identified a species that appeared to have changed little over the years. which observation would have most likely led him to this conclusion?

a
the simplest fossil organisms appeared only in the newest rocks.

b
no fossil organisms of any kind appeared in the newest rocks.

c
the simplest fossil organisms appeared only in the oldest rocks.

d
the same kind of fossil organisms appeared in old and new rocks.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

the ems is the abbreviation for the emergency medical services. it is a service provided by a group of medical professionals specialised doctors and other healthcare staff.

any one can call 911 in case of any medical emergency and a group of health care professional will come and give the treatment required. every day the ems staff receive many phone call, which are related to different types of medical emergencies, out of which 25-28% are exclusively related to the respiratory issues.

so, the correct answer is 25-28%.