What is the source of energy in our ecosystem? In our ecosystem, the is the source of all energy. In terms of the ecological pyramid, of energy is passed from one level to next level.

Why does sexual reproduction increase the genetic variation in a species? A. Sexual reproduction doubles the chromosome number. B. Sexual reproduction produces organisms with no DNA. C.

Three months after returning home from West Africa, a 50-year-old man begins experiencing a fever, cough, and muscle aches. The EMT should suspect: Select one: a. whooping cough. b. influenza. c. hepatitis. d. Ebola.

In your own words, how does a virus work?

Which of the following is not true of cells? Cells are living. Cells have the six properties of life. Not all cells are the same. Some cells are living, and some cells are not

How does the angle of the suns rays impact climate differently from the equator to the poles

Forest elephants in Africa have been confirmed as a different species from the larger savanna elephant seen here. Scientists believe the savanna elephant is as different from the forest elephant as Asian elephants are from woolly mammoths.

What competitive processes or forces are ever-present during a star's lifetime?

Which occurs during transcription? A. DNA is copied to create a second DNA strand. B. mRNA codons and tRNA anticodons assemble amino acids. C. DNA is unzipped with the aid of DNA polymerase. D. mRNA is synthesized from a strand of DNA.

In a beach ecosystem, what can limit growth of organisms? A. ocean and rocks B. oxygen C. abundant food source D. moderate temperatures

What process do the arrows for oxygen going in and water coming out represent in the Figure 9-2 diagram of the mitochondria?