How did the relative lack of water on land affect how plants evolved?

Explain the term "molecular clock" and describe the types of measurements and comparisons that can be made with this type of clock.

Choose the answer that best describes a gene. A. different allele forms of a trait B. tightly coiled strands of DNA C. the center of a chromosome D. a segment of chromosomal DNA

The current atomic model would be revised if a. better microscopes were being used to study its structure. b. better microscopes are invented in the future. c. new information about an atom's structure is discovered. d.

What is mitosis used for in multi celled organisms?

According to the Universal Law of Gravitation, every object attracts every other object in the universe. Why can't you feel the force of attraction between you and Mars?

In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black.

How do organisms obtain energy?

The right side of the heart is considered the systemic circuit pump. True or False

What is the habitat of the starfish and what does it eat

Ice sheets are in enormous masses of ice that