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3 years ago

HELPPPPPPPPPPPPPPPP MEEE PLEASEEEEEEEEEEE MARKING BRAINLIEST

Biology

1 answer:

Viktor [21]3 years ago

6 0

a. A galaxy is a collection of stars held together by their mutual galaxy. In other words, all the stars in a galaxy are <u>kept together by the gravity</u> of all the other stars (as well as the invisible, mysterious dark matter).

Mercury, Diameter: 4879.4km 57.9 million km away from sun. 0 moons

Venus, Diameter: 12104km 108.2 million km away from sun. 0 moons

Earth, Diameter: 12756km 149.6 million km away from sun. 1 moon

Mars, Diameter: 6779km 227.9 million km away from sun. 2 moons

Jupiter, Diameter: 142800km 778.3 million km away from sun. 67 moons

Saturn, Diameter: 120660km 1,427.0 million km away from sun. 62 moons

Uranus, Diameter: 51118km 2,871 million km away from sun. 27 moons

Neptune, Diameter: 49528km 4,497.1 million km away from sun. 14 moons

c. Many comets have an elliptical orbit around the Sun that brings them closer at some times and farther away at others. The adjective elliptical refers to the shape of an ellipse, which is an elongated circle, stretched into an oval.

2. Day and night are due to the rotation of a planet. (How long it takes for the planet to orbit the sun.)

3. A lunar eclipse occurs when the Earth passes between the Moon and the Sun, and the Earth's shadow obscures the moon or a portion of it. A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking all or a portion of the Sun. An eclipse can be total, partial, or annular.

4. The International Space Station (ISS) is a space station, or a habitable artificial satellite, in low Earth orbit. Its first component launched into orbit in 1998, and the last pressurised module was fitted in 2011. ... The ISS consists of pressurised modules, external trusses, solar arrays, and other components.

Maintain and grow U.S. leadership at Mars with a rover in 2020, as a first step of a sample-return strategy, searching for past life and demonstrating oxygen production. Use this mission as a building block for a subsequent round-trip robotic mission with the historic first launch off another planet and sample return through the lunar gateway and the broader exploration architecture.

Prioritize and guide investments and partnerships in long-pole technology areas and resource characterization needed for the exploration of Mars and other deep space destinations.

Develop standards for human long-duration deep space transportation vehicles.

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List a second food chain

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Answer:

see in the picture below

Explanation:

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2 years ago

Comparing Microscopes

amm1812

Answer:

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3 years ago

The sea snails in tidal marine areas feed on the dominant species of algae. What kind of interaction takes place between the sea

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2 years ago

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one

bonufazy [111]

There are four different bases that make the DNA molecule:
Adenine, Cytosine, Guanine, and Thymine.
Due to chemical properties of the bases, there are two pairs of bases that are complementary, Adenine and Thymine and Guanine and Cytosine.
So, if we have 16% of Adenine, there must be the same amount of Thymine, since they only appear in a pair.
16% of Adenine + 16% of Thymine - 32 %
the rest of the abundance of the bases can be calculated by subtracting the 32% out of the 100%: 100-32 = 68
So, Guanine and Cytosine make up 68% of the bases, and a half of that number is the amount each of the bases has in the total amount. 68/2= 34
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34% Guanine - 34% Cytosine

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3 years ago

This phylogenetic tree illustrates the evolutionary relationships of tetrapods and was constructed using both anatomical and DNA

Andreyy89

Answer:

D) Mammals are more closely related to birds because they share a more recent common ancestor.

Explanation:

Mamals, birds, amphibians, reptiles and fishes are vertebrates.
Vertebrates have the spinal cord surrounded by cartilage or bone.
Mammals are more closely related to birds because they both are evolved from reptiles.
Reptiles are tetrapod vertebrates.

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3 years ago