A researcher discovers a fossil of what appears to be one of the oldest-known multicellular organisms. the researcher could estimate the age of this fossil based on

Imagine that a researcher is comparing the sequence of several protein-coding genes among mice, rabbits, and humans. She finds that, for most of these genes, the rabbit sequences are more similar to the human sequences than are the mouse sequences.

Two humans can have different traits because they

A herniated disc occurs when ... a. there is a fracture of the vertebral arch. b. the covering of the spinal cord is torn. c. there is protrusion of the nucleus pulposus of the intervertebral disc. d. the body of a vertebra is fractured.

Which of the following is not a characteristic of Arthropods that has attributed to their diversity and success A. endoskeleton B. jointed appendages C. highly developed nervous system D. segmentation

How would a sudden decrease in the shrew population affect the barn owl population?

32. Explain why it is hard to classify organisms in Kingdom Protista? What are the definin characteristics of the kingdom?

Broken circuits can produce strong electric shocks.

How are earth's organisms and crust interdependent? read more >>?

Which technique is used to separate the different cell parts?

Where does the mitochondrial DNA originate?