Could life as we know it exist on earth if air contained only oxygen

The role of the excretory system is to rid the body of toxic waste products. Which of the following body systems also plays a direct role in removing waste products from the body? A) endocrine B) nervous C) respiratory D) skeletal

What is a cause and effect of a local environmental problem related to human activity?

A surfactant (reduces/increases) the surface tension of water and tends to (promote/inhibit) emulsification.

Explain the significance of snyder agar medium and its differential nature as a means to detect dental caries

Complete the sentence to explain how organisms develop in a changing environment. occur because beneficial traits exist in a gene pool, and makes these traits more prevalent in the population.

How does polymerase chain reaction make DNA fingerprinting more reliable

A) What are the bases of mRNA coded for by this section of DNA before the mutation? Hint in RNA A pairs with U.

How does secondary succession differ from primary succession? It begins where no plants have grown. It begins on bare rock or land. Soil nutrients are already in place. Lichens and mosses form soil first.

True of False? The structure of the cell membrane is what allows water and other molecules to move in and out of cells.

Dolphins and fish have similar body shapes. isthis feature more likely a homologous or analogoustrait?