Salt water
sand and water
vinegar
this next one is for CEMENT
Concrete is a heterogeneous<span> (composite) material consisting of </span>cement<span>, water, fine aggregates and coarse aggregates. ... Otherwise it is a </span>heterogeneous<span> material.</span>Cement<span> may be called a </span>homogeneous<span> material. But concrete is not.</span>
<span>Both of them contain a reaction center composed of chlorophyll a.</span>
To seperate the external ear from the middle ear in humans and other tetrapods, and transmit sound from the air to the ossicles inside the middle ear, and then oval window in fluids .
hope this helps a bit .
It could either be A or D