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Scorpion4ik [409]
3 years ago
5

Which of these is a way that global climate change is affecting human

Biology
1 answer:
Vinil7 [7]3 years ago
5 0

Answer:

a

Explanation:

a

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Which component is responsible for initially stimulating a muscle contraction?
Andrei [34K]

Answer:

Option B, electrochemical signals

Explanation:

The first process that initiates the muscle contraction is the binding of calcium ion with troponin protein. After this chemical interaction, the active binding sites of actin gets exposed. After this myosin binds to the actin sites thereby forming a high-energy  head bridge and releasing the pi. Mysosin now goes to a lower energy state by undergoing conformational change. This causes power stroke and actin filament is pulled towards the M-line. Later on the muscle contracts by shortening  sarcomere.

This entire process is an electrochemical process. hence option B is correct.

7 0
3 years ago
The graph shows the relationship of photosynthesis with temperature.
Hunter-Best [27]
25°C
This is the answer because this is the highest point of the parabola
5 0
3 years ago
What is the process through which the body's internal enviroment is kept safe?
Luden [163]
Buying a heater, then your body will stay warm

4 0
4 years ago
What specifically separates during meiosis ii?
anzhelika [568]

The correct option is (b) sister chromatids

sister chromatids separates during meiosis II.

<h3>What phases of meiosis are there?</h3>

Meiosis occurs in two divisions and goes through the same phases as mitosis (prophase, metaphase, anaphase, telophase). Meiosis is preceded by the interphase, in which DNA is duplicated to produce chromosomes composed of two sister chromatids. A second growth phase known as interkinesis, which can occur between meiosis I and II, does not include DNA replication.

1. Meiosis

During the first meiotic division, a reduction division (diploid haploid) separates homologous chromosomes.

P-I: The nuclear membrane dissolves, chromosomes condense, and crossing over occur. Homologous chromosomes also form bivalents.

M-I: Spindle fibers from opposing centrosomes align bivalents (at centromeres) along the cellular center.

Bivalent homologous chromosomes are compressed and separated by spindle fibers as they move to the opposite poles of the cell.

T-I: Chromosomes loosen up and the cell divides (through cytokinesis) to form two haploid daughter cells.

2. Meiosis

Sister chromatids are separated by the second division (these chromatids may not be identical due to crossing over in prophase I)

Centrosomes move to their opposite poles, the nuclear membrane breaks down, and the chromosomes condense in P-II (perpendicular to before)

M-II: At the centromere, spindle fibers from opposing centrosomes connect to the chromosomes to align them along the cell equator.

Sister chromatids are divided by constricting spindle fibers, and the chromatids—now known as chromosomes—move to the opposite poles.

T-II: Chromosomes decondense, the nuclear membrane recovers, and four haploid daughter cells are produced during cell division (cytokinesis).

Learn more about the Meiosis with the help of the given link:

brainly.com/question/8821727

#SPJ4

3 0
1 year ago
In your own words, how does a virus work?
Rina8888 [55]

Explanation:

viruses are very small -- 100 times smaller than the average bacterium, so small that they can't be seen with an ordinary microscope. Viruses can only exert influence by invading a cell, because they're not cellular structures. They lack the ability to replicate on their own, so viruses are merely tiny packets of DNA or RNA genes enfolded in a protein coating, on the hunt for a cell they can dominate.

7 0
4 years ago
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