Agenda 21, agreed to by participants at the earth summit, provides guidelines for

The correct answer for the fill in the blank is- Sustainable development.

Agenda 21 is a plan of action of the United Nations with the aim of achieving sustainable development globally. It is a product of the UN conference that was held on Environment and Development, particularly in Rio de Janeiro, Brazil ( also called Earth Summit ) in the year 1992.

Thus, it provides guidelines for sustainable development.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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.