Afunction of cell membranes in humans is the

Functions of the cell membrane in humans include:

1. It maintains the physical integrity of the cell by enclosing the cytoplasm and organelles within it.

2. Forms a barrier between the inside of the cell and the environment outside the cell, enabling different chemical environments to exist on each side of the cell.

3. Active transport. The cell membrane allows active transport  of specific molecules across the cell membrane in either direction, that is into or out of the cell.

4. Holds  embedded surface protein markers which serve to identify the cell enabling cells to communicate with each other.

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 !

i think that d. wind is the answer.   i missed the question when i answered a. currents.