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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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The earliest known mineralized structures in vertebrates are associated with .
yulyashka [42]

The earliest known mineralized structures in vertebrates are associated with feeding.

<h3>What is mineralized structures?</h3>
  • Tissues that have incorporated minerals into soft matrices are referred to as mineralized tissues. These tissues typically serve as a structural support or a shield of protection.
  • Mineralized tissues include bone, mollusk shells, radiolarians, diatoms, Euplectella species of deep sea sponges, tendon, cartilage, tooth enamel, and dentin.
  • Over millions of years of evolution, these tissues have been precisely tailored to improve their mechanical properties. As a result, there have been numerous studies on mineralized tissues because there is much that can be learned from nature, as seen by the expanding field of biomimetics.
  • These tissues are prime candidates for artificial tissue duplication due to their extraordinary structural organization and technical qualities. Mineralized tissues encourage multifunctionality, flexibility, and downsizing.

To learn more about mineralized structures visit:

brainly.com/question/2284576

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7 0
2 years ago
How does extinction of a species cause more species to develop
MrMuchimi

depending on the animal that goes extinct( like if a lion went extinct  water buffalo's populations would increase since they don't have loins killing them) hope this helps

6 0
3 years ago
The two main
Ratling [72]

Answer:

the is no anser bicos the is not a question

7 0
3 years ago
Read 2 more answers
Long chains of amino acids that determine virtually everything about a cell, including cell structure and function, cell materia
Julli [10]

Answer:

Proteins

Explanation:

Protein describes any of the numerous large, complex naturally-produced molecules made up of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds.

8 0
3 years ago
One difference between human cheek cells and onion cells is: 1. the presence of cytoplasm 2. the absence of a nucleus in the pla
AysviL [449]

Answer:

3. the absence of a cell wall in human cells

Explanation:

Animal cells do not have cell walls. Cell membranes separate the cytoplasm of the animal cells from the surroundings and maintain their interior. Plant cells have cellulosic cell walls. A cell wall surrounds the cell membrane of a plant cell. Cell walls serve to provide structural support and protect plant cells from pathogens. Cell walls also help keep excess water out of cells so they do not burst. Therefore, human cheek cells would not have cell walls while the onion cells would have cell walls made up of cellulose.

6 0
3 years ago
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