Which vitamin helps the body absorb calcium?

Influenza disease is caused by which of the following?

What is the cell wall of a plant made of ?

Which of the following aquatic animals does NOT have gills?

What is the basic unit of life?

Which process do plants use to make food?

Which of the following organism breathes from skin?

Which human organ system is responsible for producing hormones?

Which of the following is the first step of cellular respiration?

Which of the following hormones inhibits growth and is responsible for wilting of leaves?