Why is an excess of carbon dioxide in the atmosphere problematic for Earth's ecosystems?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

What type of competition exsist between two species. turtles and fish

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above