Which of these is a base?

o NaOH

o

vinegar

o HNO3

o

o HCI

Suggest why a clot that blocks the small blood vessels in the lungs can cause death.

What are the 2 main parts of a comet

What would happen if several salmon in an area were only able to lay 100 eggs instead of what they normally lay. A: The population will most likely die out since most of the eggs are usually eaten and destroyed.

If the grasshoppers in a certain area receive 500 million joules of chemical energy from the plants they eat in one day, what is a reasonable estimate of the amount of chemical energy the frogs in the same area will get from their food?

Which of the following formed from the remains of plants and animals that died millions of year ago? a. uranium b. coal c. solar power d. biofuel

Explain three disadvantages to using an electron microscope to view microorganisms.

What are the two strands of dna held together by?

Using context clues, what does predecessors mean as it is used in the first paragraph

Explain how fossil fuels found in the Earth's crust are ultimately the result of biological processes.

the trait for flower color is highly variable among certain species of rose plants leading to the formation of flowers of different colors. how did the flower color variation in rose plants come about