To calculate the density of a substance, what two properties do you need to
know?
A. Mass, volume
B. Weight, volume
C. Mass, weight
D. None of the above

A

Explanation:

the density equation is :

density=mass/volume

A. Mass, volume

Explanation:

The density of a substance is the relationship between the mass (how much matter in a substance or object) of the substance and how much space it takes up (volume).

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: