Why is it that although Nocardia spp. grow well on most common nonselective laboratory media, many are missed when the cultures are read

These organisms require 3 to 6 days to grow.

Explanation:

Nocardia are a group of actinomycetes. Some of the species of the nocardia are pathogenic to the humans. There are more than 70 species of nocardia in the world.

Some of the Nocardia spp. grow on the most common non laboratory media but many of them are missed out when the cultures are read because these organisms requires at least 3 days to 6 days to grow.

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.