Which of these is an organ?

A. white blood cells

B. heart

C. connective tissue

D. digestive system

If the na + voltage-gated channels in a muscle cell open, what will be the result?

How many liters are equivalent to 150 centiliters

All the bats living in a cave form a

1. An ecosystem consists of one oak tree on which 10,000 herbivores are feeding. These herbivores are prey to 500 spiders and carnivorous insects. There birds of the same species are eating these spiders and carnivorous insects.

only 10 percent of the energy is stored in an organism can be passed on to the next trophoc level. Of the remaniing energy, some is used for the organisms life processes, and the rest is

Hat type of substances are commonly transported into cells by channel proteins

Who received profits from a corporation? A. The employee B. The company officials C. The managers D. The shareholders

An ecosystem includes a. only exotic factors b. only biotic factors c. biotic and abiotic factors d. only abiotic factors

13. What is the name and function of the main lymphatic tissue found in the intestines? A. Thymus gland: enables the conversion of immature lymphocytes into mature T cells B.

Which of the following statements about iron is FALSE? Almost 2/3 of our body store of iron is found in the hemoglobin in our blood. Normally 10-15% of your daily intake of iron is absorbed. Vitamin C prevents the absorption of iron.