Match the given changes in the ecosystem to their causes. tiles greenhouse gases chemicals released in river excess usage of land for agriculture pairs fragmentation of forests arrowboth trapping of heat on earth arrowboth unsafe drinking water arrowboth nextreset

The correct matches are:

1. Greenhouse gases - Trapping of heat on Earth

The greenhouse gases, especially the CO2 and the methane, have properties that enable them to trap the heat in the atmosphere. So the more there is from these gases in the atmosphere, the bigger the temperature will be on the Earth.

2. Chemicals released in river - Unsafe drinking water

The chemicals that are released in the rivers result in polluted waters that are unsafe for usage, especially not for drinking. Because of the releasing of chemicals thousands of rivers have been led to a state where their waters can not be used for drinking, and considering the limited amount of freshwater, that is very alarming.

3. Excess usage of land for agriculture - Fragmentation of forests

In order to be made more land available for agriculture, the forests are cleared. During that the process, the forests are totally destroyed, and the process is constantly going on, which is why more than half of the forests in the world have already been destroyed, and probably the percentage will increase as things are going.

yeytyryyeyeyeyeyeeyeyey6

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.