Stars<span> start their lives as clouds of dust and gas. ... But if the body has sufficient </span>mass<span>, the collapsing gas and dust burns hotter, eventually reaching </span>temperatures<span> sufficient to fuse hydrogen into helium. The </span>star<span> turns on and becomes a </span>main sequence star<span>, powered by hydrogen fusion
Tangerines AmbitiousThere are a few hundred billion stars in our galaxy, the Milky Way and billions of galaxies in the Universe. One important technique in science is to try and sort or classify things into groups and seek out trends or patterns. Astronomers do this with stars.
So far we have discussed the luminosity and colour or effective temperature of stars. These can be plotted to form what is one of the most useful plots for stellar astronomy, the Hertzsprung-Russell (or H-R) diagram. It is named after the Danish and American astronomers who independently developed versions of the diagram in the early Twentieth Century.
In an H-R diagram the luminosity or energy output of a star is plotted on the vertical axis. This can be expressed as a ratio of the star's luminosity to that of the Sun; L*/Lsun. Astronomers also use the historical concept of magnitude as a measure of a star's luminosity. Absolute magnitude is simply a measure of how bright a star would appear if 10 parsecs distant and thus allows stars to be simply compared. Just to confuse things, the lower or more negative the magnitude, the brighter the star. By definition a star of magnitude 1 is 100 × brighter than one of magnitude 6. Our Sun has an absolute magnitude of + 4.8.
i hope this helps </span>
Answer:
Pansy 1 Genotype: TtRr
Pansy 2 Genotype: ttrr
Pansy 1 Gametes: TR, Tr, tR, tr
Pansy 2 Gametes: All tr
Phenotypic ratio of offspring: 1:1:1:1 (1 Tall red: 1 Tall white: 1 Short Red: 1 short white)
Explanation:
This is a cross involving two different genes; one coding for height and the other for colour in pansies. The allele for Tallness (T) is dominant over the allele for shortness (t) in the first gene while the allele for red color (R) is dominant over the allele for white color (r) in the second gene.
According to the question, a pansy
that is heterozygous for both traits will have a genotype: TtRr while a pansy that is homozygous recessive for both traits will have a genotype: ttrr
In a cross between a TtRr and ttrr, the following allelic combinations of gametes will be produced by each pansy;
TtRr- TR, Tr, tR and tr
ttrr- tr, tr, tr, tr
Using these gametes in a punnet square (see attached image), a phenotypic ratio 1:1:1:1 consisting of (4 Tall red: 4 Tall white: 4 Short Red: 4 short white) offsprings will be produced.
The brain loses 5-10 percent of its weight between the ages 20 & 90.
Answer:
There are tides, at times the moon's gravity will pull the water towards the moon because of the relationship of gravity between the earth and moon. There are high tides and low tides. High tides and low tides are caused by the Moon. The Moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the Moon and the side farthest from the Moon. These bulges of water are high tides.
Explanation:
