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Step2247 [10]
3 years ago
9

The oldest known vascular plants in the northern hemisphere are Devonian

Biology
1 answer:
mylen [45]3 years ago
6 0
<span>The oldest known vascular plants in the northern hemisphere are Devonian
This is true</span>
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The large surface area in the gut directly facilitates _____.
Flura [38]

Answer:

B. Absorption

Explanation:

  • Absorption is a process that takes place in the small intestines or ileum of the GI tract, in which simple and soluble nutrients are absorbed into the blood stream.
  • Absorption is enhanced by several adaptations of the gut such as large surface area of the gut which directly facilitates absorption of nutrients.
  • Presence of villi and microvilli in the gut increases the surface area for absorption of nutrients in the ileum.
6 0
3 years ago
Stabileste care este gradul de poluare cu deseuri menajere a cartierului, localitatii tale:
hodyreva [135]

Explanation:

Unclear question. However, I inferred you are referring to this clear rendering of the question:

Determine the degree of pollution with household waste in your neighborhood or your locality:

1. List the human and administrative (social) causes that led to such a situation.

2. What actions must be taken to solve the given problem?

3. What should be your contribution in solving the problem of environmental pollution?

4. Write an essay on the topic: "My community - the beneficial space for work."

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3 years ago
Which two cellular structures provide protection to the cell? A. nuclear membrane and vacuole B. cellular membrane and cell wall
arsen [322]

Hey there! Cellular membrane and cell wall is your answer.


7 0
3 years ago
Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period.
Leya [2.2K]
Skeletal muscle fiber is a muscular tissue that is attached to the skeletal system. the skeletal muscle fibers are striated muscles i.e have striations in their structure. The skeletal muscle fibers are voluntary muscles i.e they can be controlled.

Motor unit is a composed of a motor nerve cell attached to a muscle fiber with its axon terminals. Motor nerve cells or neurons are the types of neurons that send impulses from the central nervous system to the responding organ. The muscle fiber may be attached to many neurons not only one neuron. Collectively, all the neurons attached to the same muscle fiber are called motor pool.

A skeletal muscle twitch is the contraction of a muscle fiber in response to the minimum stimulation.

The electrical stimulus is the stimulation of a skeletal muscle fiber by using external electrical impulses. The electrical stimulus is important in many sporting and medical situations.

A latent period is a period between applying a stimulus to a muscle fiber and the response of this muscle fiber by contraction. 

3 0
4 years ago
The complete oxidation of one glucose molecule yields 30 or more ATP. Glucose catabolism includes glycolysis, pyruvate oxidation
Roman55 [17]

Answer: II. Citric acid cycle

Explanation:

Oxidation of pyruvate to acetyl-CoA does not generate energy and glycolysis generates only 2 ATP (2 ATP used and 4 ATP generated). On the contrary TCA generates as much 38 ATP.

3 0
3 years ago
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