Malik wants to create an electromagnet and searches through his house for materials. What combination of materials will generate the strongest electromagnetic field?
1. A piece of wire long enough to make 50 coils.
2. A piece of wire long enough to make 20 coils.
3. One 9 volt battery
4. Three AA batteries that equal 4.5 volts
5. An aluminun bolt
6. An iron bolt

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

this is math not biology xd

trachea, alveoli, lung capillaries, arteries

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.