Describe a key stone species.

Based on radiometric dating and the rock and fossil record, scientists have concluded that life has been present on Earth A. for about 1 billion years. B. for about 50,000 years. C. for no more than 10 million years. D. for at least 3.

The protist kingdom is sometimes called the kingdom of misfits, why might this be a true statement

the trees in a rain forest start to die. this would affect the animals and other planys of the rainforest because it would increase? A. Food. B. Sunlight. C. Rainfall. D. shelter

How are oxbows and loess similar

What trophic levels is a rattlesnake

What effect does an increase in the average kinetic energy of an object have? A. reduced particle movement B. Lower temperature C. higher temperature D. increased mass

In beetles, the gene for color and the gene for pattern are located on the same chromosome and exhibit recombination.

At what phase of meiosis is the number of chromosomes per cell doubled? What happens after that so that the number of chromosomes per cell does not end up being higher?

Unlike endocrine glands, exocrine glands a. release hormones. b. do not usually have ducts. c. release secretions outside of the body. d. release secretions directly into the blood

How the structure of DNAallows it to serve as the basis for inheritance?