Ababy star that is still gathering mass in a nebula and has not begun fusion is called

The star is called protostar.

Explanation:

A protostar is a youthful star that is as yet assembling mass from its parent sub-atomic cloud. The protostellar stage is the most punctual one during the time spent outstanding evolution. For a low mass star (for example that of the Sun or lower), it keeps going around 500,000 years.

The stage starts when an atomic cloud part first falls under the power of self-gravity; and an obscure and weight bolstered center structures inside the crumbling section. It closes when the infalling gas is drained, leaving a pre-principle arrangement star, which agreements to later turn into a fundamental grouping star at the beginning of hydrogen combination.

are there any answer choices

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 !