Why have PCBs been so hard to clean up in Puget Sound and connected rivers?

Which Marine ecosystem has a few with available nutrients and Lois

Which discovery provides the most evidence to support the idea that two species may have had a common ancestor? A They possess four limbs which they use for movement. B. They reproduce sexually. C. They have a high percentage of similar genes. D.

A weakened immune system may be caused by an overproduction of lysozymes. muscle disorders. immunodeficiency disorders. complement systems in the blood.

Human activity has led to clear cutting of the world's rainforests. Which is the best explanation of why this change has been detrimental? A) Cutting down the rainforest disrupts some trading routes.

In the same science fair, tina asks the question "does caffeine increase the heart rate of an earthworm?

Jessi consumes a diet of 1920 total kcalories that has 80 g of fat. what percent of jessi's diet comes from fat? (give answer to the appropriate reporting digit. only give the value. do not include the term percent or its abbreviation.)

Scientists break down evolution into catogories

The process of sediments being compacted and cemented to form sedimentary rocks is called A. metamorphism. B. deposition C. crystallization D. lithification

What is presumptive identification of a microorganism?

Which statement best describes the climate of a city? Select one: The average annual temperature of Austin, TX is 68.5°E San Antonio, Texas had a high temperature of 102°F today. Dallas, Texas had 8.6 centimeters of rain today.