The 30 trillion or so cells in your body require a continuous supply of oxygen and nutrients and an unending removal of waste materials. the blood carries these materials in the body's circulation within a series of closed tubes, called

What assingment is this and how did we ues it

What feature distinguishes male embryo from female at eight weeks of age? a. males have a Y chromosome b. males have well developed primary reproductive organs c. male testes have descended into the scrotum d.

How can you describe what a geologist does

As a cell becomes larger what happens to its surface area and volume

The semimetal germanium is used as a component in photodetectors, which generate electric current when exposed to light.

A 45 year-old male who is in good health presents with complaints of pain in his left heel. He states that the first few steps out of bed in the morning are extremely painful. He has no history of trauma. What is the likely etiology of his pain? A.

How can your weight vary but your mass can remain the same?

Which of these is NOT an aquatic reptile group? plesiosaurs pterosaurs ichthyosaurs nothosaurs

How are chemosynthetic bacteria different from photosynthesis bacteria

What comes first herbivores carnivores or producers