Answer:
The correct answer is - 3. three saguaro cacti, five roadrunners, and two rattlesnakes.
Explanation:
A community is a group of interacting populations, in a particular ecosystem, of different species. The group of the same species is known as the population of the ecosystem. In the desert ecosystem, there should be a different group of populations should be found that interact with one other.
Among the given options, the third list has a different kind of species present three saguaro cacti, five roadrunners, and two rattlesnakes interact with one other and depend on one other for food and energy.
Answer:
B. Without greenhouse gases, Earth would be too cold for life to exist.
Explanation:
Greenhouse gas (carbon dioxide) can reflect sunlight back to earth so it keeps the energy and make the planet warmer. Too many greenhouse gases make the planet too hot and cause global warming, but if its too little then the planet will be colder.
Colder temperature can also be dangerous as it will kill many organisms that can't resist it. The ideal condition should be in between, not too hot and not too cold.
Following the requirement of question I have attached a picture of phylogenetic tree.
Here is the source publication PNAS June 26, 2012 109 (26) 10293-10297
