Questions

Amphibians are one of the most sensitive groups to change, whether that is caused by habitat loss, invasive species, disease, trade or climate change. Their sensitivity to environmental threats has been generally linked to the observation that amphibians are characterized by a rather permeable skin. Given their complex life cycles and other traits, amphibians are often recognized as indicators of ecosystem health.

Scientists believe that , about 4.6 billion years ago, the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star called a supernova.

Both options (A & B), summarizes a result of the protestant reformation.

The Protestant Reformation was a major 16th century European movement aimed initially at reforming the beliefs and practices of the Roman Catholic Church.

Except crocodile which has 4 chambers, all the reptiles have 3 chambers in their heart.

Constant expression required in the second case, we cannot use j.