Aperson will be lactose intolerant only if he or she

A person will be lactose intolerant if they do not have the lactase enzyme.

Explanation:

Lactose is milk sugar, in technical terms, it is a carbohydrate formed by galactose and glucose. It is estimated that 75% of the world's population suffers from lactose intolerance, a digestive disorder in which carriers have partial or complete difficulty digesting sugar in milk and milk derivatives.

Lactase is the enzyme responsible for breaking down lactose in the blood, making sugar digestion easier. When there is a lack or insufficient amount of lactase in the body, sugar reaches the large intestine unchanged and accumulates.

Bacteria that produce lactic acid and gases ferment the accumulated lactose, leading to greater water retention, causing diarrhea, bloating and abdominal pain. This is the face of lactose intolerance.

answer: c

explanation:

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 !