How might a mutualistic relationship between species evolve into a parasitic one?

The relationship between the bacterium xenorhabdus nematophila and its nematode host is called

The scientific theory that describes the beginning of the universe is called the a. Expanding universe theory b. Contracting universe theory c. big bang theory d. Oscillating universe theory

Where is the least amount of energy transferred in a food web

Which of these is NOT a requirement or influence on chemical cycling of inorganic nutrients in a natural ecosystem? a. A reservoir for the elements in the Earth b. The biotic community and its food chains c. Human activities d.

Many people believe that diet soda is healthier than regular soda because it contains less sugar and fewer calories. However, several scientific studies have found that diet soda may be associated with diabetes, weight gain, and heart disease.

The cardiovascular is also known as the

An experiment was designed to test whether students could squeeze a clothespin more times in minute after resting or after exercising.

Who is alfred wegener and what are his contributions to science

A child has sickle-cell disease (ss) but neither parent is ill. What must be true of her parents' genotypes? The father is heterozygous; the mother is normal. One parent has two recessive alleles. Both parents are heterozygous carriers.

Which statement describes how diffusion works? O Molecules always move from inside of the cell to outside of the cell. Molecules always move from areas of high concentration to low concentration.