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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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How was the solar system model first used
oksano4ka [1.4K]
<span>Plato first proposed that the planets followed perfect circular orbits around the Earth. Later, Heraclides (330 B.C.) developed the first Solar System model, placing the planets in order from the Earth it was is now called the geocentric solar system model.

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3 0
3 years ago
Identify what types of of questions that can be answered by science
mamaluj [8]

Answer:

There are many questions that can be answered by science but I will provide some examples below.

Explanation:

Science involves many areas of study, <u>from biology and chemistry to physics and neuroscience</u>. Generating questions and providing answers are the most important steps in science as this process has allowed thousands of scientists to develop new drugs to treat previously-mortal diseases, to protect endangered species, to prevent population declines, to understand the behavior of fauna, among many other remarkable outcomes and discoveries.

In this answer, I will focus on some questions belonging to the life sciences areas that can be answered by science:

Biology

<em>How does climatic phenomena, such as El Niño and La Niña, affect the migration of whales?</em>

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Neuroscience (humans)

<em>Is schizophrenia hereditable?</em>

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Behavioral Ecology

<em>Does climate change affect the capability of cuttlefish to camouflage?</em>

Neuroscience (Animals)

<em>Are killer whales capable of  problem-solving?</em>

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Ecology

<em>How does the reduction of apex predator populations (terciary consumers) affect the population of secondary consumers?</em>

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Conservation Biology

<em>Why do increased temperatures lead to coral bleaching? What is the mechanism and how can it be controlled?</em>

<em />

Animal Behavior

<em>What is the mechanism that Ophiocordyceps unilateralis (Zombie fungus) uses to manipulate ants for its own disperal?</em>

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Parasitology

<em>Does the parasite Toxoplasma gondii induce erratic behaviors in humans?</em>

5 0
3 years ago
Help me with this asap, please
siniylev [52]
22. D, that means the soil uhhhh helps the roots to grow??? Also because sunlight causes photosynthesis- sorry i’m not good at this hope it helps
3 0
3 years ago
True or false? variation in human skin color is an example of clinal variation.
ICE Princess25 [194]
The answer is false,it comes from genes that you get from both your parents
4 0
3 years ago
Ethylene is an organic compound produced by ripening fruits. In a controlled experiment, researchers found that ethylene gas sti
luda_lava [24]

Answer:

<h2>Ethylene is a gaseous hormone in plants, it is a fruit ripening hormone.</h2>

Explanation:

Ethylene is a chemical signal through which ripening fruits trigger the ripening process in fruits, Studies on components of ethylene signaling have shown a linear transduction pathway leading to the activation of ethylene response factors. However, the whole pathway by which ethylene selects the ripening-related genes and interacts with other signaling pathways to regulate the ripening process still not yet fully known. Most fruits produce ethylene that starts the ripening process. Its level in under-ripe fruit is very low, but as fruit develop, the production of ethylene become larger that speed up the ripening process of fruit.

4 0
3 years ago
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