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malfutka [58]
3 years ago
14

How does a placenta form?

Biology
1 answer:
LekaFEV [45]3 years ago
7 0

Answer: Placenta forms by fertilized blastocyst embeds in the uterine wall, and development of the fetus and placenta begin. ... These remodeled vessels become a source of maternal blood for the placenta. The placenta develops to bring oxygen and nutrients to the fetus and to move harmful waste and nutrients away.

Explanation: I looked it up on google.

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22 (101 HC) Why have none of the competing hypotheses about the origin of life on Earth been developed into a scientific theory?
Margaret [11]
Because you cannot test it or observe it.

A scientific theory are created through the scientific method, in the scientific method you need to be able observe it and experiment. 
5 0
3 years ago
How come one type of matter can be converted to a totally different one?
wariber [46]

Answer:

Explanation:

En física, la materia es todo aquello que se extiende en cierta región del espacio-tiempo, que posee energía y está sujeto a cambios en el tiempo y a interacciones con aparatos de medida. Se considera que es lo que forma la parte sensible de los objetos perceptibles o detectables por medios físicos.

Etimológicamente, proviene del latín materia, que significa «sustancia de la que están hechas las cosas» y que también alude a la «madera dura del interior de un árbol»;1​ la palabra está relacionada con māter («origen, fuente, madre»)2​ y se corresponde con el griego hyle3​ (de hylos: «bosque, madera, leña, material»)4​5​ que es un concepto aristotélico de la teoría filosófica del hilemorfismo.6​

El uso moderno del término va más allá de la noción clásica de sustancia, y los físicos denominan materia a cualquier entidad cuya presencia en una cierta región del espacio-tiempo conlleva que el tensor energía-impulso para dicha región es diferente de cero.

8 0
3 years ago
The 14th and 15th Amendments protected African Americans' right to citizenship and the right to vote.
Reil [10]

Answer:

The answer is they passed the Jim Crow Laws, D

8 0
3 years ago
What is the only common infection of the reproductive tract caused by a protozoan?
Gala2k [10]

Answer:

Trichomoniasis

Explanation:

Trichomoniasis is an sexually transmitted disease that affects around 30% of world population. The common symptoms are frequent urge to urinate, vaginal bleeding, burning sensation during urination.

The causative agent of trichomoniasis is a protozoa called <em>Trichomonas vaginalis</em>. This protozoan can be transfer through the genital contact. The protozoa can easily be transfer from affected individual to the healthy individual.

Thus, the correct answer is option (3).

6 0
3 years ago
What is the mathematical formula for:
disa [49]
They are undergoing mitosis 2^7=128 but they started with 4 cells not two cells so it’s 2^6 which means 6 generations... tell me if turns out to be right
3 0
3 years ago
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