Jamal’s father and grandmother are both diabetic. Jamal shows no signs of diabetes.

Which most likely explains why Jamal never suffers from diabetes even though he has the genes that can cause it?

He got the diabetes genes from his father.
He refrigerates his food so it will not spoil.
He lives in a city with good air quality.
He makes healthy lifestyle choices.

D

Explanation:

Process of Elimination:

A is incorrect; it suggests that he has diabetes

B is incorrect; the quality of his food doesnt affect his glucose levels

C is incorrect; air quality has no correlation to his glucose levels

D is correct; diabetes ( type 2 ) is caused by unhealthy lifestyle, therefore we can assume he has a healthy lifestyle because he has no diabetes

the answer is a or when it says crossing over

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 !