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3 years ago

Stars are made primarily of helium and hydrogen. True False

Biology

2 answers:

bixtya [17]3 years ago

5 0

Answer:

false

Explanation:

A giant ball of gas, primarily hydrogen and helium, which undergoes nuclear fusion

dolphi86 [110]3 years ago

4 0

Answer:

This is false.

Explanation:

Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. ... Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them.

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Which should you do in the event of a catastrophic hurricane?

fiasKO [112]

HIDE IN THE BASEMENT is the best choice hope i helped!

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3 years ago

Populations evolve for many reasons. Suppose there is a population of plants that have either purple flowers or white flowers, a

sattari [20]

Answer: natural selection

Explanation:Natural selection, gene flow, gene drift and mutation are the mechanisms for EVOLUTION.

The dominant purple allele must have been acquired from previous parent gene, by natural selection

Definitely the available alleles from previous flower population were white and purple flowers. But, because the parents of purple flowers exhibit VARIATION, in their gene pool, they showed dominance over the recessive white colour flowers in the same population.

◼ from Darwin’s observation and deduction, Organisms who acquired certain characteristics from variation tend to survive than others, and therefore pass these inheritable characteristics to their offspring.

◼Thus the purple flowers dominated the population for the available resources, among the other flowers colours, (competitions) therefore it leads to a stable population in size after a period of time., while the white colour flowers are recessive

◼Darwin concluded that, variants of best adaptation will be selected for by natural conditions operating in the environment of the population at that particular period (natural selection).

Based on this, natural selection takes place, and the purple flowers with best variation will have selective advantage (dominance)above white colour flowers(recessive).

Consequently, they have higher survival rates compare to white flowers in the population this is survival of the fittest by natural selection of purple flowers

The frequency of the white colour flower will reduced because of less manifestation of traits from generation to generation from reduced gene pool due to recessive trait, however the frequency of Purple flower will increase because the number of copies of allele of purple flowers is greater than the total number of all the flowers population( white flowers+purple)

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3 years ago

What protects the brain?

Setler [38]

Tha answer would be D (the skull)ㅤㅤㅤㅤ

3 0

2 years ago

Read 2 more answers

Easy points 1 suggest what the drug longmasterol might do to the body to affect reaction time 2describe the effect of longmaster

Semmy [17]

Answer:

4.Antagonistic muscles are muscles that have opposite effects to one another,As one relaxes, the other contracts.

5, This is to move bones in tandem to cause locomotion.As as one contracts, and the other relaxes, the bone is pulled and this shifts the position of the bone to cause locomotion.Note, a muscle cell usually pull in one direction.,

6. it lacks nucleus to have enough space for oxygen carrying molecules(haemoglobin)it has bi-concave shape to squeeze through tinny capillaries to reach tissues and have large surface area for oxygen carriage.They contain Oxygen carrying pigment Haemoglobin.

1.This is a stimulant that increases the rate of excitability by increasing the synaptic connection through increase in amount neurotransmitters, at synaptic junctions

2,This accelerate the rate of ageing.Leading to premature aging.it ,may affect the heart efficiency and the entire cardiovascular system at the long run.

3. After a period of time this may cause liver damage by blocking blood flows to the liver.It may also lead to inhibitory effect of detoxification activities of the liver.This leads to hepatic failure.

7. A state of matter can only be compressed at the gaseous state.it can not be compressed at solid because the inter molecular forces are very strong and the molecules of solids are well compact. Molecules of liquids are not free neither, although their molecular force are weak, But the molecules can not be compressed, since they lack random motion.

8. This is due to the lattice arrangement of water molecules in ice, resulting in lesser density of ice compare to that of water. The lower density of ice makes ice to float when it freezes, however, it is the higher lattice arrangement in ice which makes it expand, compare to other liquids which makes it less dense and therefore floats.

10. This can be caused by the force that pull water through the mains to the pipes.it is measures in bars. Thus 1 bar is equal to the force per unit area lifting water to a height of 10 meters.

9. This is to generate a forward thrust, to overcome the aerodynamic drug.The propeller engine generate a thrust, which ensure a steady speed large enough to overcome the drag

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2 years ago

A client, age 87, with major depression undergoes a sixth electroconvulsive therapy (ect) treatment. when assessing the client i

zysi [14]

The nurse found a transitory short and long term memory loss and confusion. Electroconvulsive therapy is a kind of a procedure that done under general anesthesia, this procedure can changes the brain chemistry by giving the patient a small electric current that will pass through the brain intentionally making a small fast seizure. That’s why there are some side effects is memory loss, some memory problem improve after the treatment ends.

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3 years ago