NO LINKS
air contains about 78% nitrogen and 21% oxygen. Based on this information, one can conclude that air?
A.is a pure substance.

B. is a mixture of at least two gases.

C. consists of different states of matter.

D. consists of components that are chemically joined.

Chemists predict the geometry of molecules based on the repulsion of electron pairs. Molecules can be represented by the general formula AXY, where Y is the number of peripheral atoms. We would expect the geometric shape of a molecule represented by the formula AX3 to be

A) linear.

B) tetrahedral.

C) trigonal planar Eliminate

D) trigonal bipyramidal

True or False?

Density of ocean water is not affected by salinity (salt content).

The Koppen Classification System splits the world into 5 climate zones.

What was used to determine these 5 different zones?

There are 3 correct answers.

Vegetation

Temperature

Animal life

Precipitation

Water Quality

What is the SI unit for weight? NO LINKS I will give brainliest
(and no its not kg)

HElp i will give you brainliest

What is coevolution? *
A. When two species evolve in response to each other
B. When 2 sub group of the same species evolve at the same time
C. When the environment and the animals within the environment evolve at the same time

Based on the pedigree, how many offspring from this cross had the recessive phenotype?

(17 Points)


one


two


three


five

Which two minerals can be scratched by a knife but not copper coin?

(a) What human activity is responsible for the formation of smog and acid rain? (b) What kinds of harm does photochemical smog cause? (c) Do you think that photochemical smog levels are high during the winter or during the summer? Explain.

NO FILES OR I REPORT >:-((

We can drink water straight from the ocean without purifying it.



True

False