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Katarina [22]
3 years ago
12

Which term best describes a pure substance that is made up of only one type of atom

Biology
1 answer:
svetoff [14.1K]3 years ago
3 0

Element describes a pure substance that is made up of only one type of atom. Elements cannot be broken down into more simpler substances. There have been 118 elements discovered by scientists so far. 

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Identify one of the key external difference between vertebrates and invertebrates.
77julia77 [94]

Vertebrates have a bilateral symmetry due to which their entire body is divided into right and left halves while the invertebrates either have radial symmetry or the bilateral symmetry. Therefore, option D is correct.

The other basic differences between the vertebrates and the invertebrates are that vertebrates have a spinal cord and a backbone while invertebrates lack them, vertebrates have well developed brain, lungs or gills in respiratory system and closed circulatory system.


6 0
3 years ago
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A unique feature of dna is that it can duplicate itself through a process called
Brut [27]
<span>A unique feature of dna is that it can duplicate itself through a process called replication.</span>
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2 years ago
The innermost serous membrane covering the heart is the: Group of answer choices synovial layer peritoneum visceral pleura visce
stepan [7]

<u>Answer:</u>

<em>There are innermost serious membranes that cover the heart is Parietal Pericardium.</em>

<u>Explanation:</u>

Heart is <em>covered by pericardium</em> in two sides, inner and outer sides. The inner membrane is parietal pericardium and the outer one is visceral pericardium. Pericardium is made up of <em>fiber tissues</em> that strongly protect the heart from all around.

The<em> main function of pericardium</em> is to protect the heart from any injuries and prevent the infections. The serious pericardium helps in<em> lubricating the heart. </em>

3 0
2 years ago
All cells are contained within a membrane called the:
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Explanation:

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6 0
3 years ago
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A ____ is the underlying combination of genetic material present (but outwardly invisible) in an organism.
Alex

Answer:

D (Genotype)

Explanation:

A genotype is the genetic make up of an organism i.e. what the genetic material

of an organism constitutes. Genotype describes the set of genes contained in an organism's genome. According to Mendel, an organism receives two forms of genes called ALLELE for a trait, one from each parent. The genotype of a specific gene coding for a trait is represented by each pair of allele for that trait.

Although the genotype of an organism is outwardly invisible i.e. cannot be seen, but it determines the phenotype of that organism i.e. the outward appearance. For example, if a plant receives T and T alleles coding for tallness, from each parent. The genotype of that plant for the specific height trait will be (TT). Hence, the TT genotype although invisible but controls the tallness of the plant.

5 0
2 years ago
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