What four major divisions make up the history of life on earth in the geologic time scale

How would the environment change if there were fewer plants to carry out photosynthesis? It would have more oxygen. It would have more glucose. It would have more ATP energyIt would have more carbon dioxide.

Scientists can determine if oxygen existed in Earth's Archean atmosphere by A. determining the amount of outgassing that occurred. B. looking for oxidized iron in rocks. C. looking at the amount of salt content in rocks. D.

When is the manual removal of oil by hand most likely to be used? A.) When the spill is far out at sea B.) When the oil has sunk to the bottom C.) When heavy equipment cannot reach the spill D.) When the oil has already started to break down

What three atoms do carbohydrates, lipids, proteins, and nucleic acids all share in common?

A scientist is using a computer model to predict changes to a population of rabbits in a meadow. Identify the information about the rabbit population that should be included in the computer model.

An element's atomic number is 49. How many electrons would an atom of this element have?

Which is the ability of a cell membrane to allow materials to pass through it called

The brain and spinal cord are formed from a. the notochord, which forms from endoderm b. the neural tube, which forms from mesoderm c. the neural tube, which forms from ectoderm d. the notochord, which forms from mesoderm

Missy spencer was given penicillin for tonsillitis. she developed a severe life-threatening allergic (hypersensitivity) reaction to the penicillin. her medical file records this reaction as a (n) :

What situation most likely explains the occasional high frequency of certain inherited disorders among human populations established by a small population?