How many years did the Precambrian Era span? 2.5 billion 5 million 5,000 none of the above

Which atoms form ionic bond? a. two sodium atoms b. two fluorine atoms c. magnesium and lithium d. magesium and bromine?

What is the responsibility of the respiratory system?

What effect can an ocean have on the climate? a-rushing water from tides cools the land. b-there is no influence on climate from an ocean. c-warm ocean air causes a dry climate.

Would you expect a tall desert plant to be a vascular plant explain

Which process is most associated with chemical weathering?

Which structure is unique to plant cells? A. cell membrane B. centriole C. cell wall D. vacuole

Is the ganglia in the PNS or CNS

Which of the following provide chemical evidence of ice ages? A. variations in pH levels in fossils B. concentrations of compounds in rock C. variations in ratios of isotopes in fossils D. concentrations of compounds in old trees

Duty is defined as intermittent operation in which the load conditions are regularly recurrent.

After a game of football, David tries to calm down by relaxing in the swimming pool. He tries to get this breath back and relax to avoid muscle cramps.