Hybridization .

occurs frequently in nature

is the process of gene combination in a lab

usually produces offspring that cannot reproduce

creates genetically identical offspring

The correct answer is: c) usually produces offspring that cannot reproduce.

Explanation:

Hybridization, also knowns as selective breeding, is an artificial process that involves selecting parents with specific characteristics in order to obtain an offspring with the same traits.

Hybridization is very common and has been performed by humans for thousands of years: from selective breeding crop plants, to do so with dogs in order to create more desirable breeds.

Option A is incorrect because hybridation does not occur in nature, it is an artificial process.

Option B is incorrect because hybridation often happens when the selected parents are chosen to reproduce (by a human).

Option D is correct because an important amount of hybrids are sterile (for example: mules).

Option D is incorrect as well because the offspring is not identical: it shares a combination of genes from both parents.

usually produces offspring that cannot reproduce

Explanation:

Hybridization is the process of crossing two organisms usually of different species, genus or families but of desirable characters to produce organisms known as hybrids.

Hybrid organisms combine the characteristics of both parents and because of the difference in genetic composition of the parents, they are often sterile and hence, cannot reproduce.

Therefore, hybridization usually produces offspring that cannot reproduce.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.