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Lady bird [3.3K]
3 years ago
11

Why does menstruation happen?

Biology
2 answers:
DedPeter [7]3 years ago
6 0
The menstrual<span> cycle </span>occurs<span> due to the rise and fall of hormones</span>
Troyanec [42]3 years ago
4 0

During that, menstruation stops because the blood came from the uterus protect it and give nourish to the fertilized egg. It usually happen because a sperm cell meet it. When menstruation happens, it develop an egg cell and carried out with the lining of the uterus called the endumetrium because it dies.

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A man with type A blood marries a woman with type B blood. Their child has type O blood. What is the genotype of the woman
Sedbober [7]

Answer:

The genotypes of the two parents are AO and BO. Blood types A and B are dominant over blood type O,

Explanation:

An offspring inherits their genotype (genetic makeup) from their parents with each parent providing one allele for a given trait. An offspring need only inherit one dominant allele to have the phenotype (observable physical characteristic) of that trait and must inherit a recessive allele from each parent in order to have that phenotype. For example, brown hair is a dominant trait and only one parent must provide that allele for hair color in order for their offspring to have brown hair. In order for the recessive trait of blonde hair to be the phenotype of the offspring, each parent must provide the blonde hair allele.

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2 years ago
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Evgen [1.6K]
I think it will be d: the sun
4 0
3 years ago
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The flow of energy through an ecosystem can be depicted in a food web. What organism forms the base of the open ocean food web?
I am Lyosha [343]

Answer:

algae

Explanation:

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4 0
4 years ago
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Minchanka [31]

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