Which plants first developed a circulatory system?

a.

Mosses

c.

Ferns

b.

Worts

d.

Horsetails

Where is earth's mantle located?

Which of the following best describes how crossing over occurs during meiosis? A. During prophase I, homologous chromosomes are lined up and pulled apart to opposite poles. B.

Can a dragon with forelimbs be made with the allele combination forelimbs, no forelimbs?

Which of the following is not true of saliva? A. cleanses the mouth B. contains enzymes that begin the breakdown of proteins C. moistens food and aids in compacting of the bolus D. dissolves food chemicals so they can be tasted

What are the stages called that organism goes through from birth to death A: metamorphosis B: longevity C: lifespan D: life cycle

The function of a neuron is to

Can a molecule may contain two atoms of the same element

What are the warning signs of COPD?

Which describes the genetic code in a human? A. Different genetic codes appear in each different type of cell. B. Every human has the same exact genetic code. C. Genetic codes change frequently in reaction to external factors. D.

Over time, natural selection results in species that are what?