Which best characterizes the precambrian era?

a. abundant plants and animalsb. dinosaursc. small, one-celled organisms and primitive jellyfishd. extensive mountain building?

Which would be the best test to determine if an individual plankton in a water sample is a phytoplankton or a zooplankton?

Which of these choices is a goal of the National Park Service Organic Act? A. To establish air-quality standards and regulate emissions of air pollutants B. To limit the carbon emissions of fossil fuel power plants C.

What is biological evolution? a) the change in the gene pool of a population over time b) the ability of an individual organism to acquire traits c) the adjustments individual organisms make to their environment

What store color pigments

In what ways are cellulose and starch similar

If an amino acid has a side chain (r group) that is charged (i. e. bears a full + or - charge), which amino acid group would it belong in?

If an object with a mass of 100 kg on earth is taken to a planet that has more gravity, how will this affect the object's mass and weight?

Lamarck's mechanism of change can be called

What is carrying capacity and what does it mean for ecosystems?

Why was the evolution of a coelom a critically important innovation for animals? a) The coelom can act as a hydrostatic skeleton. b) The coelom gives rise to a complex nervous system. c) The coelom made it possible for animals to colonize land.