Describe how three different organism - human, flatworms and fern obtain the oxygen they need for survival.

What is the length of time an organism can be expected to live

The first non modern fossil of a human relative to be discovered, and recognized as such, was the:

What killed the great beasts of North America

In the geologic past, abiotic factors such as volcanic eruptions have had an impact on the availability of resources. Volcanic eruptions impact the availability of which resource? A. Carbon dioxide B. Minerals C. Sunlight D. Water

How can length of day affect temperature

Air pollution is caused by A. natural events and human activities. B. human activities but not natural events. C. heavy rainfall. D. the sun.

Which of the following can increase the growth of algae when it enters streams? A) insecticide B) herbicide C) carbon dioxide D) oil

Which are the best examples of types of molecules used for energy storage by organisms? Choose all answers that are correct. A. lipids B. proteins C. nucleic acids D. carbohydrates

Tell me five different invasive species

How much energy is produced by each type of macromolecule