Nitrogen fixation is carried out primarily by

Humans

Plants

Bacteria

Consumers

Earth's first atmosphere contained little or no what

Is a substance with equal numbers of h + ions and oh - ions a acidic solution

g Analysis of mitochondrial DNA can answer interesting and important questions. For which of the questions would analyzing mitochondrial DNA be futile? Are you my father?

African lungfish, which are often found in small, stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation? a) urea takes less energy to synthesize than ammonia.

Mountain formation can result when which of the following occurs? A Two oceanic plates collide. B) Two continental plates collide. C Two oceanic plates spread apart. D None of the above.

Fungi are necessary evil to humanity. discuss the pros and cons this assertion

You want to test the effect of sucralose on the growth of a plant. Design a study using the steps of the scientific method. What are the dependent and independent variables in this experiment?

Which of the following organisms does not rely on krill as a major food source? Adelie penguins Leopard seal Humpback whale Squid

When a predator catches its prey, it may appear that the prey species suffers. But there are benefits to this type of interaction for prey species as well. What are two way in which the prey species might benefit from the predator hunting them?

What is significant about the amino acid methionine in protein synthesis