Which characteristics are common to most salamanders? check all that apply.

a) they undergo internal fertilization.
b) they lose their tails as adults.
c) they have wet, moist skin.
d) they have long, strong legs.
e) they begin life with gills.

Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. what could he have done to increase the validity of his data? reduce the number of plants. remove the 1 hour group. add a 0 hours control. measure the oxygen in liters

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel