Which of these elements are the least dense?

1. Oxygen and Silico

2. Iron and Magnesium

3. Iron and Nickel

4. Magnesium and Silicon

Two common species of frogs from the genus Bombina (B. bombina and B. variegata) live in similar latitudes and ecological conditions, but in two different regions, Central and Eastern Europe.

Explain the importance of the change in minute ventilation with exercise.

Two laws of thermodynamics

What is the function of a circulatory system? it brings a transport liquid into close contact with all cells in the body. it is the site of blood cell production. it acts as a reservoir for the storage of blood.

Which of these stopped operating in 2011? A. space shuttle program B. Kepler Space Telescope C. Hubble Space Telescope D. International Space Station

Which of the statements best describes the process of crossing over during meiosis? Haploid daughter cells trade chromosomes in pairs. Homologous chromosomes pair up and exchange segments of DNA.

A marine clam is mistakenly added to a freshwater aquarium. What will happen to the clam and why? Popcorn sold at movie theaters is very salty, causing people to become thirsty and to buy so drinks. Explain why salty popcorn causes this thirst.

What is the function of reproductive system?

A diploid cell with 2n = 20 chromosomes goes through meiosis. how many chromosomes will each of the daughter cells have?

What is the best definition of a niche