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Lady_Fox [76]
3 years ago
15

Explain the three events in sexual reproduction that contribute to genetic variation in a population.

Biology
1 answer:
Serhud [2]3 years ago
6 0
Is that question from school
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Based on the scientific name streptococcus agalactiae, what morphology would you expect these cells to have? g
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3 years ago
3 Which statement best describes a cause and its effect that occurs during the process of muscle contraction? A. The release of
Y_Kistochka [10]

Answer:A. The release of calcium ions causes myosin and actin to attach to each other.

The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins  called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.

Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.

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3 years ago
Structure,of a compaund microscope and it's parts and functions​
spin [16.1K]

Answer:

Compound microscopes have more than one lens to generate high magnification images of flat, thin specimens. There are three major structural parts of a microscope: Head, Base, and Arm. ... The light is then collected and formed an image by an objective lens. We see the magnified images through the eyepiece

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3 years ago
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I’ll give brainliest :) !!<br><br> Root hairs, a part of the root tissue system, does what?
Furkat [3]

Answer:

The third option is correct.

Hope this helps.

7 0
3 years ago
5.
kipiarov [429]

Answer:

C. Vaccination

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vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.

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