How do seismic waves scientists understand earth's layers? select the two correct answers.
1.scientists can observe which seismic waves change the composition of the layers they pass through
2.scientists can observe how seismic waves multiply when passing through different layers.
3.scientists can observe how seismic waves change speeds when passing through different layers.
4.scientists can generate seismic waves in order to observe their paths through earth.
5.scientists can observe which seismic waves cannot pass through certain layers.

the answer to your question is sperm

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.

reflection is the bouncing back of a propagating wave when it encounters a barrier; usually shows an image of the source of light wave

1) bounces back from an opaque material

2) bounces back from the boundary

3) seen in mirrors

refraction is the bending of a propagating wave having a shift of direction as it passes through different media; usually seen in lenses to magnify or lessen

1) passes through a prism

2) moves from one medium to another

3) seen in lenses