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Andru [333]
3 years ago
10

Which structural feature of the cell membrane allows molecules such as oxygen and carbon dioxide to diffuse into and out of the

cell?
A. The cell membrane contains proteins molecules
B. The cell membrane contains cholesterol molecules.
C. The cell membrane is made up of two layers of phospholipids
D. The cell membrane is anchored to the cytoplasm by the cytoskeleton
Biology
1 answer:
Effectus [21]3 years ago
7 0
I think it's A
the cell membrane contain protein molecules 
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Which organisms utilize a one way air flow through their lungs to maximize air flow efficiency and oxygen consumption?
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<span>Birds

Birds are organisms which utilize a one-way air flow through their lungs to maximize air flow efficiency and oxygen consumption

The process of respiration is essential in the oxygen/carbon dioxide cycle. Respiration removes OXYGEN from the atmosphere and produces and releases CARBON DIOXIDE to the atmosphere.answer is letter D.

Respiration driven by a mechanical series called inhalation and exhalation. We inhale or breathe in oxygen and exhale or breathe out carbon dioxide. 
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4 years ago
The U.S. has sent unmanned spacecraft to _____ the planets in our solar system. A. all B. most C. some D. none of
Mandarinka [93]
<h3>Answer:  A. all</h3>

Every planet in our solar system has been visited by an unmaned spacecraft sent by the United States. The launch years are given in this order

  • Venus (1962)
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  • Mercury (1973)
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5 0
3 years ago
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Variation within organisms within a species increases the chance that a species will survive changing conditions. What kind of r
Alekssandra [29.7K]
Sexual Reproduction with the most adapted organisms within the species 
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3 years ago
According to the cladogram below, which of the following organisms had a
horrorfan [7]

Cladograms are graphic representations of the relationship between different taxa according to derivated characters. Option A is correct. Group D has a segmented body and jaws, but no limbs.

<h3>What is a cladogram?</h3>

A Cladogram is a graph drown as a tree, which is based on cladistic analysis. It represents the common ancestral relationships and the emergence of different characters among the involved groups.

  • The tree-type graph is a ramified diagram that represents the relationship between the involved taxa.

  • The cladistic analysis follows the maximum parsimony criterium. Explains the character state from the point of view of the fewest changes through history.

Explains evolution with the minimal amount of evolutive changes.

It recognizes the monophyletic groups as natural groups. These groups are the clades, and their classification -sequencing- represents their phylogeny.

  • The sequencing term refers to lists of groups according to their relation. One group is the brother-group of the following one.

So the cladogram represents the relationship between groups according to a derived character.

The derivated character is any trait that a group passes to its descendants.

Through evolution, the characters change, and new changes are added. When referring to a derivate character, we mean that all the subsequent species in the cladogram carry the trait.

In the provided cladogram, segmentes bodies, jaws, limbs and other traits are derivated characters.

<u>Group D</u> has a segmented body and jaws, but does not express limbs.

This last trait emerged later in history and is expressed by groups E, F and G.

Option A is correct. Group D.

You can elarn more about cladograms at

brainly.com/question/27405768

brainly.com/question/11912782

brainly.com/question/12275760

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5 0
3 years ago
When we say that an experiment is controlled, we mean that _____.
Juliette [100K]

Answer:

c

Explanation:

An experiment in which an observer tests a hypothesis by looking for changes brought on by alterations to a variable. In a controlled experiment, an independent variable is the only factor that is allowed to be adjusted, with the dependent variable as the factor that the independent variable will affect.

in Basic terms  The control group provides a baseline that lets us see if the treatment has an effect.

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3 years ago
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