What is humus?

A) A term to describe soil that is not fertile.

B) The broken down remains of plants and animals.

C) A type of soil that cannot retain water for long.

D) A mixture of man-made articles such as plastic and glass.

What has caused the greenhouse effect to become imbalanced? * O More plants on earth O A hole in the ozone O Burning more fossil fuels

1) Bones function as levers for the muscles to provide movement of the body. What is the function of a tendon in the skeletal system? A) link bones to bones B) link muscle to bones C) link muscle to muscle D) link muscle to ligaments

If shell fragments are found in a rock sample, it is most likely that the rock formed a) on a mountian slope c) from magma b) on a glacier d) in shallow water

Inflammation of the gums is called: Select one: a. dental carries. b. pyorrhea. c. halitosis. d. gingivitis.

Water that can be reused is called

How is "bottleneck effect" considered to be a mechanism?

Unlike bryophytes, ferns A. have vascular tissue. B. exhibit alternation of generations. C. utilize photosynthesis. D. have to get water from the environment.

Modern cell theory is best described as being based on

The internal iliac arteries supply blood to the A. diaphragm. B. urinary bladder and rectum. C. lower leg. D. spleen. E. reproductive organs.

What cells are made from already existing cells