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3 years ago

11

Human embryos have a developmental stage during which they have a tail and pharyngeal pouches (those pouches develop into gills

in fish). how can we explain these characteristics of human embryos?

1 answer:

laiz [17]3 years ago

4 0

<span>Human embryos share a common ancestor who had gills.</span>

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Which of these is unique to flowering plants?haploid gametophytes,an embryo surrounded by nutritive tissue,double fertilization,

fiasKO [112]

Answer:

double fertilization

Explanation:

Flowering plants or angiosperms are seed-producing plants with the ability to produce reproductive organs-flowers and fruits with seed in it (unlike gimnosperms which contain naked seed). Another distinctive feature of angiosperms is their reduced gametophytes. This feature most likely reduces the time between pollination and fertilization. Fertilization in flowerin plants is double, meaning that two sperm cells fertilize ovule cells(egg cell and central nuclei cell): one forms diploid zygote which will develop in embryo, while other form triploid cell which will develop into endosperm (provides nutrition for the embryo).

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3 years ago

How is petroleum different from natural gas

Tpy6a [65]

Answer:

Petroleum gas is mainly C3 and C4 based (propane and butane), whilst natural gas is predominantly C1 and C2 (methane and ethane). Petroleum gas is generally produced via the cracking of naphtha, which is one of the components separated during crude oil refining.

Explanation:

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2 years ago

A 2-year-old swallowed watch batteries. Following ingestion, kidney function was impaired, and the heart began to fail. Which of

kvv77 [185]

Answer:

Coagulative necrosis

Explanation:

When cell death occurs due to ischemia or infarction then this is termed as Coagulative necrosis.
During this type of necrosis, cell death occurs in a localized area due to lack of oxygen and other nutrients.
When a two year old swallows watch batteries then these batteries becomes trapped in the digestive system and inside the digestive tract , the positive and negative terminals of the battery gets bridged by the mucosa leading to the production of the electrical current and increase in the pH of the mucosa.
All these condition leads to coagulative necrosis due to which the kidney gets affected and heart failure occurs .

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3 years ago

Why might it be easy to overlook cancer in its early stages

Talja [164]

Answer:

Explanation:

So that it can be better for the person

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2 years ago

List the organs of digestions in order from the esophagus to cloaca

Anna007 [38]

Esophagus
Stomach
Small intestine
Large intestine
Cloaca

That's just the alimentary track (minus the couple that come before esophagus such as mouth and pharynx) so if you need digestive glands and accessory organs let me know cause I know those too

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3 years ago