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sattari [20]
3 years ago
8

What was the first artificial satellite placed in orbit around the Earth? (3 points)

Biology
1 answer:
olga55 [171]3 years ago
5 0

The answer would be Sputnik 1. This was a Russian space probe launched during the Space Race between the Soviet Union and the United States.

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What is the Division of somatic cells that involves duplication of DNA in diploid # called
Rama09 [41]

This would be Mitosis.

Mitosis results in two diploid cells.

Meiosis, on the other hand, results in four haploid cells.

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2 years ago
Why are coastal wetlands important and what are the sources of pollution that affects them?
vaieri [72.5K]
Coastal habitats provide ecosystem services essential to people and the environment. ... Services provided by coastal wetlands include: Flood Protection: Coastal wetlands protect upland areas, including valuable residential and commercial property, from flooding due to sea level rise and storms. pollution kills much of the life that lives there and radically decreases biodiversity
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In which direction will air currents most likely move
exis [7]
D from the sea to the land
6 0
2 years ago
In the disease myasthenia gravis, the human body makes-by mistake- antibodies to its own acetylcholine receptor molecules. These
andre [41]

Answer:

Muscle contraction function.

Explanation:

The nerve endings possess synaptic acetylcholine vesicles ready to be released. The action potential depolarizes the presynaptic terminal and increases the concentration of axoplasmic calcium; Acetylcholine molecules are thus released, so that the concentration of the neurotransmitter at postsynaptic (nicotinic) receptors is temporarily increased. This is followed by post-synaptic membrane depolarization, muscle membrane action potential with increased rnioplasmic calcium concentration, and finally muscle contraction. Acetylcholine is hydrolyzed by acetylcholinesterase and resynaptic at the presynaptic level by cholinecetyltransferase. The etiopathogenesis of myasthenia gravis is autoimmune and there are antibodies against acetylcholine receptors that circulate in the blood, as well as a decrease in the number of receptors on the motor plates, that is, it is produced by the postsynaptic blockage of the myoneural plaque, that generates fatigue and localized or generalized muscle weakness that is characterized by the worsening of the contractile force of the muscle.

6 0
2 years ago
Which of the following statements is true of soluble fibers? a. They are not viscous. b. They retain their tough texture after b
mamaluj [8]

Answer:

The answer is "Option C".

Explanation:

The soluble fiber was fiber and in the diet which is prescribed to increase metabolism, reduce cardiovascular problems, cure constipation, and is ideal for patient diabetes.

  • This consumes food water and provides support with gel-like characteristics, which are rich in fiber in foods like rice, fruits, and bovines.  
  • They all are essential for fitness, digestion, and preventive medicine. It draws in liquid(water) while absorption and transforms into a gel. It slows it down the digestive cycle.
6 0
2 years ago
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