The answer would be: a) Frost-wedging happens when water freezes and breaks rocks.

Normally, the volume of a substance will become lower when the temperature drops but when water becomes ice it will expand. Water that freezes into ice can produce a high pressure from the expansion of their volume. If enough water fills a joint in a rock, the rock might get enough force to fractured or break. This will happens in the area that has a freeze-thaw cycle like in the polar climate.

5 0

2 years ago

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Cnidarian bodies are either in the polyp or medusa form with tentacles surrounding the mouth. What type of symmetry do they have

kap26 [50]

Answer:- Option a radial symmetry

Explanation:-

Most of the organisms have can either of the two types of symmetry:-

1. Bilateral symmetry- A body is said to have a bilateral symmetry when it can be divided into 2 equal halves on either side of a single plane.

For e.g if you cut the letter M from middle vertically then you have two equal halves.

2. Radial symmetry - A body is said to be radially symmetrical if it can be divided into similar halves in any plane. This means that the organism has its body parts arranged around a central main axis.

The cnidarians whether in polyp or medusa from exhibit radial symmetry because if you cut them in any plane you will get equal halves.

7 0

3 years ago

In North America, many top predators, such as wolves, have been driven nearly to extinction. What effect do you think this has o

Andrews [41]

The pray will dear if so there will be more dear romming than other animal

5 0

2 years ago