How does the manipulation of an independent variable during a scientific experiment allow a scientistto find a cause and effect relationship between the variables

If billy shot a pellet gun at a block of wood hung by a string what would happen to an unmoving block of wood after the pellet hits it

The tissue called phloem has what function in vascular plants?

Eventually, Homo erectus migrations were limited to certain areas; they could not inhabit certain areas because of a climatic change known as the Pleistocene which was: a. a period of global warming b.

What are three differences between plant and animal cell organelles

Notice the population of beetles. The allele for color is seen on their backs: green and brown alleles. Over time, through random chance, the gene pool of the beetle population changes. Eventually the gene pool contains only green alleles.

An experiment was conducted to determine which type of fruit attracts the most fruit flies. Equal sized pieces of apple, pear, and banana were placed in separate containers at different areas around the school.

In the F2 generation of Mendel's crosses, A. all plants had the dominant trait. B. half of the plants had the dominant alleleC. all plants had both the dominant and recessive alleles. D. one in four plants had two alleles for the recessive trait.

In a population, when the birthrate becomes higher than the death rate, the population's growth rate A) decreases. B) increases. C) slows to a stop. Eliminate D) levels off and remains constant.

Types of calcareous marine microorganisms

Which of the following are examples of the first specialized tissues? A. antennae B. eyes C. kidneys D. tentacles