An increase in carbon dioxide increases the temperature of Earth. This increase leads to in ecosystems. The increased temperature in cold regions was observed to cause the melting of snow. So, species living in these regions will face .

What is the part of the cell cycle process by which chromosomes in a cell nucleus or separated into two identical sets of chromosomes each in its own nucleus

Classify the structures as homologous or analogous, depending on their structure and function.

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2