Approximately how long ago did the sun form? 4.5 million years ago 4,000 years ago 4.5 billion years ago none of these are correct

Describe some possible effects of large scale mutations.

What causes air pollution in cities such as Los Angeles?

Which best describes the trophic level of an organism? A. the number of calories it consumes B. the amount of energy it produces C. its life cycle from birth to death D. its position in a food chain

Whichof the following statements below is a result of genetic engineering? A. an orange that has a prolonged shelf life. B. a daffodil that attracts insects for pollination. C. a butter squash that has high nutritional value. D.

Compare the health and environmental risks associated with ground-level ozone to the health and environmental risks associated with ozone layer depletion.

Acid precipitation is an agent of what kind of weathering?

When do scientists consider a hypothesis valid? A. when the hypothesis is testable B. when the hypothesis is published in a scientific journal C. when more than one person supports the hypothesis D. when experimentation shows it to be true

In cherry trees, white flowers are dominant over pink flowers. cross a homozygous dominant tree with a purebred recessive tree. what is the phenotypic ratio of the offspring? a. 4 ww b. 4 white selected: c. 4 ww d. 4 pink

What happens to Earth when it is farthest from the sun? A) It moves fastest, B) It stops rotating, C) It moves slowest. D) It stops revolving

Deer ticks are responsible for spreading Lyme disease. This organism, which feeds on the blood of warm-blooded organisms like mice, deer, and humans, is best described as a (1) predator (3) parasite (2) scavenger (4) host