Scientists argue that the first organisms on earth were ___ - - - that is, their metabolism did not require oxygen.

1) multi-cellular

2) anearobic

3) aerobic

The process of fission is a type of fertilization sexual reproduction asexual reproduction meiosis

Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.137 Bq/g.

In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). A heterozygous guinea pig (Rr) and a homozygous recessive guinea pig (rr) reproduce and have 10 offspring.

Why is it a good idea to study experimental subjects in their natural enviroment?

The circulatory, or cardiovascular system, is composed of a. heart, arteries and veins. b. lungs, heart and brain. c. heart, blood and blood vessels. d. lungs, blood vessels and heart.

The science dealing with body structures and functions is called A. physiology B. cytology C. anatomy D. histology E. anatomy and physiology

Which factors affect the movement of ocean currents? Select three correct answer

What happens when a dendritic cell detects a pathogen? Select one: a. the dendritic cell secretes antibodies b. the dendritic cell will produce immunoglobin c. the dendritic cell consumes the pathogen by phagocytosis d.

When and how does the amount of DNA (c-content; where c isthe quantity of DNA in a haploid genome) in a cell's nucleus changein the course of the cell cycle?

What does a d u k a r y o t e have that a prokaryote does not