Embryonic stems cells differentiate into various tissues. Research suggests 1 point that it may be possible to replicate stem cells from mouse embryos. In the
future, human stem cells may be used to replace human tissue damaged
by diseases such are Parkinson's disease and multiple sclerosis. Why might
the use of stem cells taken from a patient to replace damaged tissues
decrease the potential risk to a patient? *
Retrieving donor stem cells from human embryos is difficult and controversial
Stem cells taken from a donor and implanted into a patient can be rejected by the
patient's immune system
Stem cells may not be able to differentiate into the correct cells and tissues needed
from the patient
Stem cells from a patient will not be destroyed by the patient's own immune system

the answer to you question is   jet streams

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !