There are diffrent types of cells for every job in your body. how do we refer to those cells that develop differently?

a) they are unidirectional.
b) they are unorganized.
c) they are specialized.
d) they are usually damaged.

The correct answer is c they are specialized.

Explanation:

Human body contain various types of cells and each specific type of cell performs specific functions.

  For example nerve cells help in propagation of action potential from one neuron to the next.

    Heart cells of our body act as a pump.Basically heart cells pump blood.

    Blood cells helps in transport of various biomolecules and fight against invaded pathogens.

  Lung cells helps in the exchange of oxygen and carbon dioxide gas to and from our body.

  kidney cells helps in the filtration of blood and formation of urine

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.