Answer:
-The moon orbits the Earth
-The Earth orbits the Sun
-The Moon orbits the Earth but not the sun
Might be b I might be wrong
Answer:
The frequency of homozygous recessive offspring in a cross between two heterozygotes is 25%.
Explanation:
Since the alleles are of two types, that is dominant and recessive alleles. An heterozygous parent will have both alleles.
So, we can represent our dominant allele with G and the recessive allele with g.
Then, the two heterozygous parents will have Gg genes.
These alleles will be segregated into their singleness. the first parent will therefore have G and g and the second parent will also have G and g
Crossing these alleles using punnet's square, we the have the following genotypic ratio of the progenies: 1GG: 2Gg: 1gg
Therefore, the 1gg is the only heterozygous offspring out of the expected four offsprings. This made the frequency to be 1/4 X 100 = 25%.
There aren't any options so I am just assuming this, based off of research of course. :)
Use and chemical composition
They prevent energy of some of the absorbed solar energy from leaving the Earth’s atmosphere