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katovenus [111]
3 years ago
6

What is true about heart valves?

Biology
1 answer:
NemiM [27]3 years ago
8 0
C.they separate atria from ventricles, and ventricles from the large arteries that leave them.
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How many body cells does a gamete have
Harlamova29_29 [7]
"Body cells<span> are </span>body cells<span> or somatic </span>cells<span> are produced by mitosis. ... </span>Gametes are sex cells, so the egg and sperm. They are considered haploid because each gamete contains<span> half the number of chromosomes that an organism's somatic </span><span>cells will have" So Gamete has 23 Chromosomes</span>
3 0
3 years ago
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tamaranim1 [39]

Answer:

The diagram is not given.

Explanation:

The ovary is the part of the carpel that becomes fruit after fertilization. The carpel of the angiosperms is the female reproductive part of angiosperms that consist of ovary, ovule. It produce eggs cells and developing embryo.

5 0
3 years ago
Why does the efficiency of a complex machine decreases as more simple machines are used ?
bearhunter [10]

By the law of conservation of energy, the energy input to a system must equal the output. However, when there are more moving parts in a machine, like in a complex machine, the energy converted to non-useful energy, such as the production of heat energy via friction, is increased. Therefore, the more the moving parts, the greater the losses of energy due to increased friction. This is why complex machines are less efficient.  

3 0
3 years ago
Which is true regarding all X-linked disorders?
attashe74 [19]

Answer:

They are caused by mutation of the X chromosome.

Explanation:

  • In an XY-chromosomal system of sex determination, Both X and Y- chromosomes are Sex chromosome.
  • Genes on sex chromosome are called sex linked genes.
  • Sex linked genes are referred to as X-linked while Y-linked genes are the ones located only on the Y-chromosome.
  • The genes located in on Y chromosome are holandric.
  • Human females are homozygous for X chromosome while Human males are hemizygous i.e. they have only one X-chromosome and another Y chromosome.
  • Disorders caused due to the mutation in the X chromosome  are called X- linked disorders. Some examples are Hemophilia, Fragile X-syndrome etc.
  • Sex lionked  disorders can be X-linked Dominant disorder or X- linked Recessive disorder.
  • The Dominant disorders are present in every generation, and affected males come from affected mothers. Daughters of affected fathers are always affected but sons of such father are not affected.
  • The recessive disorders are more common in Males and these males come from affected mothers or carrier mothers. The affected females come from affected father and an affected or carrier mother.
8 0
4 years ago
Read 2 more answers
Classify the following as either a specific or a nonspecific defense of the body's immune system. • skin
AleksAgata [21]
Specific-b cells, t cells, antibodies 
non specific- mucous, fever, macrophages
Bacteria is not a defense, it is a pathogen that causes an immune response.
I had this homework before, and I got a perfect score. These were my answers. :D
7 0
3 years ago
Read 2 more answers
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