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Olegator [25]
3 years ago
12

Define light year, and explain how and why light years are used to measure distance in the universe

Biology
1 answer:
Paha777 [63]3 years ago
6 0

A light-year is the distance that light travels in empty space in one year. Since the speed of light is about 300,000 km per second (about 186,000 miles per second), then a light year is about 10 trillion kilometers (about 6 trillion miles).

The light year is used in astronomy because the universe is huge. Space objects such as stars and galaxies may be hundreds, thousands or millions of light years away.

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6) The scientific method
Rasek [7]

Answer:

Can be used for simple experiments at home or in the classroom

7 0
3 years ago
In horses, Chesnut hair color is recessive to black. The pacing gait is recessive to trotting and long hair is recessive to shor
Vitek1552 [10]

9:3: 3:1  is the phenotypic ratio showing traits as black and long hair : black and short hair: chestnut and long hair: chestnut and short hair when a chestnut horse heterozygous for pacing and hair length with a hybrid horse.

Explanation:

Dominant trait = black hair colour (BB,Bb), trotting (TT,Tt) , long hair (LL,Ll)

recessive trait = chesnut hair colour (bb), pacing gait (tt), short hair(ll)

cross between chestnut horse heterozygous for pacing and hair length will have alleles as BbLl

alleles for hybrid horse will also be heterozygous Bb, Ll

Punnett square to show the cross:

      BL         Bl       bL         bl

BL  BBLL  BBLl     BbLL    BbLl

Bl   BBLl    BBll     BbLl      Bbll

bL  BbLL  BbLl      bbLL     bbLl

bl    BbLl  Bbll       bblL        bbll

phenotype ratio

black and long hair : black and short hair: chestnut and long hair: chestnut and short hair

9:3: 3:1  is the phenotype ratio.

3 0
3 years ago
On a dichotic listening task, A. people can accurately monitor two tasks at the same time, except when the tasks are both audito
RideAnS [48]

Answer:

B. people notice little about the message that they are supposed to ignore

Explanation:

In dichotic listening task people are able to concentrate on one voice while ignoring the other. It is observed that during dichotic listening task people concentrate more on one task than other. Sometimes dichotic listening task is used to examine the selective attention of brain. In the test the person is subjected to two voices simultaneously over the headphones and asked to pay attention either one or both voices. Then he is aked questions about the content.

Example; If you are talking on the phone with someone in a room  filled with voices of other people, you would be able to listen and concentrate at the voice on the phone while ignoring the other voices because of dichotic listening.

Example; If you are attending a seminar of a psychology professor and some peoples are talking in the hall you would be able to concentrate on the voice of the professor because of dichotic listening.

7 0
3 years ago
Besides the outside layer of the cell, where else is the phospholipid<br> bilayer found?
adoni [48]

Answer: The phospholipid bilayer can also be found in organelles that have a membrane such as the nucleus, mitochondria, chloroplasts etc.

8 0
2 years ago
The growth of a plant toward light is an example of _____.
Svetradugi [14.3K]
The most appropriate answer is Response !!

It is due to auxin present in tip of stem !!
8 0
3 years ago
Read 2 more answers
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