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Len [333]
3 years ago
8

Which of the following is an example of an estuary?

Biology
1 answer:
marissa [1.9K]3 years ago
6 0
A. Upstream part of a river
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Pollination is the step that starts double fertilization. Each pollen grain contains two nuclei. One is the _______; the other i
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Explanation:

Hey there!

Your answer is option B.

Generally, in double fertilization one nuclei reacts with egg and form zygote and other reacts with polar nuclei. On this process, fruits and seed are found to be formed.

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13

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Multicellular animals have levels of organization. What characteristic of cells makes this possible?
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A simple diagram of a DNA molecule is shown below. Which of the following is represented by X?
Reil [10]

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From the diagram X = <u>base pairs</u>

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Genetic information stored within DNA is used for growth, reproduction, and cell repair. DNA, deoxyribonucleic acids, are long-chain, helical macromolecules made of specific sequences of covalently bonded monomers called nucleotides.

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Nitrogenous bases cause nucleotides to form hydrogen bonds with other nucleotides as base-pairs. The four types of bases each make the nucleotides  Thymine and Cytosine (pyrimidine bases) along with Guanine,  and Adenine, (purine bases). In base-pair formation, Adenine forms double bonds with Thymine, and cytosine forms triple bonds with guanine.

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