Salt, nacl, is formed by the ionic bonding of sodium and chlorine. the ions, one sodium and one chlorine, have a charge. what is the overall charge of the nacl molecule?

a.-2

b. 0

c. 1

d. 2

Which of the following is an example of how human activities are impacting the survival of species? wolves overfeeding on rabbits humans creating animal sanctuaries El Niño causing a shift in the migration of a school of fish Heavy rains causing a

Which term best describes the movement of water thought cell membrane

Which of these is NOT a main type of tissue? connective skeletal nervous muscle

Directions: Create an example food chain for a simulated ecosystem that shows the transfer of energy starting with the sun and ending with the wolf. You will need to decide on a possible producer that would be appropriate for this habitat.

Red blood cells are placed into a solution of unknown solute concentration. After an hour they have all burst open. The best explanation is that the solution 1. had a very high concentration of solutes. 2. was at equilibrium. 3.

you are running an experiment trying to figure out how water affects plant growth for three orchid plants you recently bought. The orchids are the same species and you will place the plants next to eachother in the same windowsill.

The living world is organized in levels. Biotic and abiotic factors also can be arranged into levels of biological organization. Put the words below in order from the least complex to the most complex

Which of the following, when taken up by the cell, binds to the repressor so that the repressor nolonger binds to the operator? A) ubiquitin B) inducer C) promoter D) repressor E) corepressor

Which of these organisms would be a producer? A. fish B. grasshopper C. flower D. snake

A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him