What feature of the fossil Pikaia led scientists to classify it as a chordate?

A. Tentacles

B. A definite head region

C. A notochord

D. Segmentation

In general you should not drive closer than ___ feet to a bicycle when passing

Which of the following elements are major components of the human body? calcium iron phosphorus carbon

Which of these processes require mitosis

Why don't the smooth muscle fibers within the wall of an artery receive their nutrients from the blood within the lumen of the artery?

Strep throat is a common human illness often caused by bacteria streptococcus pyogenes which term best classifies the colonies of streptococcus pyogenes in a person with strep throat

Mendel hypothesized that gametes have only one factor or allele for each inherited trait. This hypothesis is supported by the observation that A) diploid cells are produce by meiosis. B) haploid cells are produced by meiosis.

The plasma membrane is composed of several different macromolecules which macromolecule serves as the fluid interface between the intracellular and extracellular environments

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. They result in either an individual having too many or too few chromosomes in their genome.

During which stage of disease should an infected person be considered contagious

A scientist observed the boundrary between teo tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result suppor the theory of plate tectonic? Why or why not?