Which is an organ?

1 heart

2 circulatory system

3 blood

4 muscle tissue

What feature in a cell contains the DNA sequence to make a specific protein? chromosome gene genome nucleic acid

What is the term used to describe the body's stimulation of respiration based on PaO2 instead of PaCO2? Select one: a. Hypoxic drive b. Carbon dioxide toxicity c. Hering-Breuer reflexes d. Hypercarbic drive

The epithelial tissue found in areas subject to considerable friction and abuse, such as the skin, is

Since humans reproduce then grow and our population grows, does our planet Earth gain mass little by little?

You are trying to find the best maximum source of energy for an organism. Which of the following compounds would you choose? A. glucose B. oxygen C. ATP D. Pyruvate E. NADH

Coal is used to produce energy. The harmful gases produced by coal are cleaned up by a method which needs a large amount of limestone. Predict and explain the long term effect on the environment of obtaining and using limestone.

True or false two genes may not segregate independently if they are on the same chromosmoe

Blood pressure rises and falls in a pattern corresponding to the phases of the

Immune system cells enter a resting phase after undergoing mitosis. when activated-for example, by an infection-they can reenter the sequence of events in the cell cycle that leads to cell division.

How does a muti-celluar organisms organise