The placenta forms from the combination of fetal tissue and tissue from what structure?

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Answer 1

Answer: The placenta forms from the combination of fetal tissue and maternal tissue. The placenta is used a barrier between the fetus and mother, and plays three important roles. First, it attached the fetus to the uterine wall. Second, it expels the fetus' waste products to the mother's blood. Third, it allows the mother to pass on plenty of nutrients to the fetus throughout the pregnancy.

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Which is the best definition of a phylogenetic tree
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Which checkpoint requires a cell to be of adequate size in order to move to the next phase in the cell cycle? G1/S checkpoint G2 checkpoint G0 checkpoint M checkpoint

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G1, G0 means the cell is not participating in the cycle the very first checkpoint is G1

Which of the following categories includes the most distantly related organisms?(A) family
(B) species
(C) class
(D) genus
(E) order

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In order, it goes:
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species

So in this case, it would be (C) class

The answer is C. Class

Which of the following lymphoid organs is NOT matched with its function? bone marrow:_________ a) form lymphocytes Peyer's patches: b) site of B cell maturation thymus: c) site of T cell maturation spleen: d) remove old red blood cells

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Answer:

Peyer's patches: b) site of B cell maturation

Explanation:

B lymphocytes are produced in the bone marrow and get mature in the bone marrow only so the site of B cell maturation is bone marrow, not Peyer's patches. B cells produce antibodies that help in destroying microbes.

Peyer's patches are lymphatic tissue mass which is found especially in the mucosa and submucosa of the ileum. This lymphoid organ has a large number of B lymphocytes which monitors the intestinal bacteria and prevents the growth of pathogenic bacteria in the intestine.

Sequences represented by the letters in this molecule enable human cells to

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I'm guessing the end to that question reads "reproduce?" We would be talking about a molecule of DNA or DeoxyRiboNucleic Acid.

Two types of plankton are microscopic plants called....?

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Plankton is an organism that moves ... Mainly there are two types of zooplankton, ... Copepod is another type of zooplankton, called as the sea insects because they ...

Answer: Two types of plankton are ZOOPLANKTON and PHYTOPLANKTON. Microscopic plants are called PHYTOPLANKTON

Explanation:

The the single factor tested in an experiment is

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Variable is the single factor tested in an experiment.

Variable is any factor or condition that can be tested, changed, or measured in an experiment. Scientific experiments have various kinds of variables. They include independent variables, dependent variables, constant variables and extraneous variables. The independent variable is the only factor that can be changed in a science experiment.

variable is the single factor

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