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nataly862011 [7]
3 years ago
8

Choose the definition of: Invertebrates

Biology
2 answers:
yanalaym [24]3 years ago
5 0
Without backbone or having no backbone is considered as INVERTEBRATES.

hope its help...

--kcirejay:♥)
djverab [1.8K]3 years ago
5 0

The correct option is (a) having no backbone.

Invertebrates are the category of organisms that lack backbone. They have some soft tissues and because of this their body is soft as compared to that of vertebrates. Example: jellyfish and sponges. Some of the invertebrates have outer covering which is very hard called as exoskeleton. This helps them to protect from outer injuries and harsh conditions. Example: cockroach, spiders, etc.



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Which of the following options correctly describes the behavior of a tetrad during anaphase 1 of meiosis?
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The answer is; C

Homologous chromosomes have the same genes on the same loci. However, they may have different forms of the same gene called alleles. These sister chromosomes, of a homologous pair, separate during anaphase I of meiosis. The two daughter cells formed will, therefore, have half the genetic material as the parent cell. This is because they will only have one set of the genes (as in diploid organisms) and are called gametes.


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How is it possible that over 20 million living organisms on the planet are made up of only 5 types of nucleotide based arranged
almond37 [142]

Answer/Explanation:

The DNA in all living organisms is made up of 4 bases, adenine, thymine, guanine, cytosine. The RNA replaces thymine with uracil, making 5 types of nucleotide. The number of nucleotide pairs in a genome can range from half a million up to 100,000 million - meaning there are an exponential number of combinations of these 4 bases.

Imagine an organism exists that has only 2 nucleotides (<u><em>this is over 200,000x smaller than even the smallest bacterial genome</em></u>). If we allow any nucleotide at each of the 2 positions, then we have 4x4 (4²) or 16 possible combinations of sequences. For a nucleotide length of 4, the total number of possible combinations are 4⁴ or 256.

Since we are dealing with many millions of nucleotides, there are essentially infinite combinations of nucleotides, giving rise to the variation that produces over 20 million organisms on the planet.

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Explain what nuclear, or atomic, process most likely results in geothermal energy. Also state why this nuclear energy will last
ELEN [110]

Explanation:

Nuclear energy does not produce electricity on its own. The nuclear energy it produces is used to heat water . The hot water then turns to steam that is used to turn dynamo turbines. This is thermal energy turned to mechanical energy.  The dynamo turbines turn the mechanical energy into electric energy.

Nuclear energy lasts longer because the same volume as compared to fossil fuels produced a larger magnitude of energy, million of magnitudes larger. Therefore with the controlled release of this enormous energy, nuclear energy can last much longer than fossil fuels.

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3 years ago
In this Gizmo, only one crossover is allowed in each segment. In reality, crossovers can occur at almost any point along the chr
nikitadnepr [17]

Answer:

Meiosis and Genetic Variation.

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When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It results in new combinations of genes on each chromosome.

When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. This is called independent assortment. It results in gametes that have unique combinations of chromosomes.

In sexual reproduction, two gametes unite to produce an offspring. But which two of the millions of possible gametes will it be? This is likely to be a matter of chance. It is obviously another source of genetic variation in offspring. This is known as random fertilization.

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