Which is biotic?

wind

iron gate

sunlight

dead leaf

Which of the following would NOT be expected to cause allele frequencies to vary over time A. Migration B. Random mating C. Mutation D. Genetic Drift E. Natural selection

Liver cells, bone cells, nerve cells, muscle cells are called?

Imagine a pond. What term correctly describes the interactions of the organisms that are located in the pond community and the physical factors of the organisms' environment? Will the correct answer be ecosystem?

Which best describes the relationship between the terms "frequency," "wavelength," and "hertz

Which would likely live near a crack in the deep ocean floor that spews scalding water? A. halophile B. methanogen C. thermoacidophile D. Eubacteria

What is the medium in which sound travels inside a bird's body?

Which best describes a gene? A: different allele form of a trait B: tightly coiled strands of DNA C: the center of a chromosome D: a segment of a chromosomal DNA

The growth of organisms in an ecosystem can be limited by the amount of water and light the ecosystem receives. a. True b. False

What is the most likely cause of plate movement? A) radiation from the sun B) cold air currents on earths surface C) heat convection within the earth D) movement of ice sheets

The closer together a magnet's magnetic field lines are, a. the weaker the magnetic field. b. the stronger the magnetic field. c. the closer they are to the magnet's center. d. the closer they are to disappearing.