Which came first, the long tongued moth or the long tubed flower?

Answer-Sea flows act a lot of like a transport line, moving warm water and precipitation from the equator toward the posts and cold water from the shafts back to the tropics. In this manner, sea flows manage worldwide atmosphere, assisting with balancing the lopsided dissemination of sun powered radiation arriving at Earth's surface.

Answer:

Explanation: Have a nice day and let me know if this helped!

In the summer night sky, some stars appear that are not visible in the winter night sky due to the Earth's orbit around the Sun. Here's why:

1. Earth's orbit: The Earth orbits the Sun in an elliptical path, taking approximately 365 days to complete one revolution. This means that as the Earth moves around the Sun, the night sky we see changes throughout the year.

2. Seasonal tilt: The Earth's axis is tilted relative to its orbit around the Sun. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to the changing seasons. During summer in the northern hemisphere, the North Pole is tilted towards the Sun, resulting in longer days and shorter nights.

3. Nighttime visibility: In summer, the longer nights allow us to see different parts of the night sky compared to winter. When the Earth is on the side of its orbit that faces away from the Sun during summer, we are looking in a different direction compared to winter.

4. Constellation visibility: The constellations we see in the night sky change depending on our position in the Earth's orbit. In the summer, we can see constellations such as Cygnus, Lyra, and Aquila, which are not as visible in winter. Similarly, winter constellations like Orion and Taurus are more prominent in the winter night sky.

5. Stellar movement: Some stars are visible only during specific seasons due to their position in the night sky. As the Earth orbits the Sun, the stars appear to shift their positions in relation to our observation point on Earth. This causes certain stars to appear or disappear from view depending on the time of year.

In conclusion, the appearance of stars in the summer night sky compared to the winter night sky is primarily due to the Earth's orbit around the Sun, the seasonal tilt of the Earth's axis, and the changing visibility of constellations and stars throughout the year.

If a boy is born with connected earlobes, he has no E alleles because the allele for detached earlobes is dominant (E), whereas the allele for attached earlobes is recessive (e). So, the correct option is B.

What is Dominant allele?

A dominant allele is one that will overpower a recessive allele's expression. Hence, only the trait linked to the dominant allele is manifested when a dominant allele and recessive allele coexist in the genotype of offspring. Consequently, for a recessive allele phenotype to manifest, both of the recessive allele must be present in the progeny.

A recessive allele causes connected earlobes (e) while the dominant earlobe detachment allele (E)

A child with the EE genotype would have disconnected earlobes.

As features of dominant alleles are manifested in heterozygous genotypes, offspring with the Ee genotype would also have disconnected earlobes. Only the child with the ee genotype would have connected earlobes. A homozygous recessive genotype is genotype ee.

Thus, the correct option is B.

Learn more about Dominant allele, here:

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Answer:

B. He has no E alleles.

Explanation:

In order for the boy to have an attached earlobes phenotype, he must have no E alleles, because the E is dominant. So his genotype must be ee. If he has even just a single E allele (like Ee) he will have detached earlobes, because the dominant trait will mask the expression of the recessive trait.

Why not A or D: Heterozygous Ee (one of each allele) would result in detached earlobes.

Why not C: If he has no recessive alleles, EE, he would have detached earlobes.

B is the correct answer!