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r-ruslan [8.4K]
3 years ago
15

No system is completely closed off from its surroundings

Biology
2 answers:
Taya2010 [7]3 years ago
5 0

Answer:

B. A capped thermos

Explanation:

I took the test

s2008m [1.1K]3 years ago
4 0

No system is closed off by it surroundings.

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Use the drop-down menus to complete the statements. Anthers release pollen, which lands on the of another flower of the same spe
Tema [17]

Answer:

See the answer below

Explanation:

Anthers release pollen, which lands on the stigma of another flower of the same species. The pollen grain produces a pollen tube that grows down the style, to the ovary, and into the ovule. The sperm cell fertilizes the egg cell. The ovule develops into the seed, and the ovary becomes the fruit.

<em>During fertilization in plants, the anther which carries pollen releases pollen grains. Once the pollen lands on the stigma of a flower of the same species, it germinates. The pollen grain produces a pollen tube that grows through the style of the stigma down to the ovary and into the ovule. One of the sperm cells fuses with the egg cell of the ovule to form the zygote while the other sperm cell fuses with the polar nuclei to form the endosperm in a process known as double fertilization. After fertilization, the fertilized ovule becomes the seed and the ovary becomes the fruit. </em>

5 0
3 years ago
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A cyclin called cyclin E forms a complex with a cyclin-dependent kinase called Cdk 2. This complex is important for the progress
Thepotemich [5.8K]

Answer:

B. The amount of unbound cyclin E is lowest as the cell enters S.

Explanation:

The reproduction of the cell is a cycle that it regulates by itself, depending the  demand of a certain cell.

In the case of the mitosis, in Each change from G1 to S to G2 to M is regulated by some proteins like the cyclin.

In the case of the cdK2 is ncessary to pass the control point to pass from the stage G1 to the stage S.

Another characteristic of the cyclins, is that these proteins are synthetized and degraded constantly during the hole process.

Hope this is a useful info

8 0
3 years ago
Advantages of evergreens
Deffense [45]
They grow and develop all year. this gives them an advantage over other trees.
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3 years ago
Hemoglobin is the iron-containing compound that carries oxygen in the bloodstream?
madam [21]
The answer is yes or the statement is true.
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What are stem cells?
Hunter-Best [27]

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Explanation:

Stem cells are cells with the potential to develop into many different types of cells in the body. They serve as a repair system for the body.

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