Tentative explanation of a phenomenon that can be tested

G If we (humans) do not have enough oxygen to allow aerobic respiration to occur, what will happen? Group of answer choices We will produce lactate/lactic acid through fermentation We use CO2 also present in the air instead We die We will produce

How do most primary producers make their own food? Select one: a. by breaking down remains to make carbon dioxide b. by changing water into carbon dioxide c. by using light energy to make carbohydrates d.

A closed series circuit could be a circuit with A. three paths and the switch is off. B. one path and the switch is on. C. three paths and the switch is on.

To conduct a phylogenetic analysis, we need an outgroup to: a. determine which character states are ancestral and which are derived. b. determine which characteristics to include in our analysis. c.

Food surfaces and equipment are not fully cleaned and sanitized until they have been:

A dam is built in a remote area to provide electricity to nearby towns. What is an unlikely effect of the dam?

What is true of mass extinctions? A All life on Earth dies when a mass extinction happens B In each mass extinction, over 50% of animal species died. C Mass extinctions happen frequently. D There is no evidence for past mass extinctions.

What is the web like structure in the cell during division

What sensitizes an individual to an allergen?

How can a trait decrease an organism's chance of survival in a specific environment?