What is true of mass extinctions?

A All life on Earth dies when a mass extinction happens

B In each mass extinction, over 50% of animal species died.

C Mass extinctions happen frequently.

D There is no evidence for past mass extinctions.

What exactly is a fossil? Anything more than 5,000 years old that is stone Any object that has been preserved by humans Only the footprints of dinosaurs Any remains or imprints of life that have been naturally preserved

What class of flatworms is the largest parasitic group?

How long does a penis take to develope

On which thickly clouded planet has radar mapping revealed a varied topography consisting of plains, highlands, and thousands of volcanic structures? A. Venus B. Jupiter C. Mercury D. Neptune

Which of the scientists responsible for cell theory would be the most likely to write a book titled Cells Come from Cells

How is nitrogen removed from sewage?

Fungi are plants which: *lack cell membranes *lack chlorophyll *are unicellular

For the majority of exercisers, adding excess protein or amino acid supplements to an adequate diet will stimulate muscle building. question 3 options: a. True b. False

Name the important chemical elements that circulate throughout the environment?

Sally wonders how much of a role genetics plays in determining her weight. she has heard about a gene, called ob, that codes for a protein that maintains homeostasis by regulating food intake and energy expenditure in response to adipose tissue.