The process by which new species arise through gradual change over time is called:

Which of the following is the main cause of muscle fatigue during intense exercise?

Which of the following elements is a key component of the hemoglobin molecule besides iron?

The scientific study of the relationship between organisms and their environment is called:

The disease caused by the deficiency of protein in diet, especially in children, is called:

Which of the following minerals is essential for maintaining fluid balance in the body?

Which of the following is used as a natural pesticide?

The gas exchanged during cellular respiration that is released as a waste product is:

The primary function of red bone marrow is to produce:

Which of the following is a common antibiotic derived from a fungus?

Which of the following is the main reason ice floats on water?