A seed is a plant organ that consists of an embryo, tissues, and a protective coating.
The ovule is defined as the structure that gives rise to the female reproductive cells and consists of three parts: the integument, its outer layer, the nucellus which is the remnant of the megasporangium, and the female gametophyte which is formed from a haploid megaspore at its center.
The ovules are found attached to the placenta in the ovary through stalk-like structures that develop into seeds after fertilization where the seeds consists of an embryo, tissues, and a protective coating.
Thus, a seed is a plant organ that consists of an embryo, tissues, and a protective coating.
Learn more about Fertilization, here:
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Particles in warm temperature rise while the particles in cooler temperature sink:
Temperature is a calculation of the mean kinetic energy of a substance's atoms or molecules. Heat is the transition of energy from a material at higher to a material at lower temperature. When heat is provided, the particles in liquids and gases acquire kinetic energy, which increases vibration and start moving faster.
Thus as the particles travel farther apart, they take up more space, due to which particles in warm temperature rises, as it allows the liquid or gas to move upward. While cooler liquid or gas travel downward because no external energy is provided to them, thus on acquiring low temperature, the inter-molecular forces between particles increase which deduct spaces between them.
Answer:
The large molecules made up of small monomers are called macromolecules.
Explanation:
In biochemistry macromolecules are the complex molecules that are formed by the polymerization of simple monmeric subunits.
For example
Polysaccharides are formed by the joining monosaccharides by glycosidic linkages.
Protein or polypeptides are formed by the joining of amino acids by peptide bonds.
Lipids are composed of fatty acid monomers
Nucleic acid such as DNA and RNA are formed by the joined of their monomeric subunits a;so called nucleotides by phosphodiester linkage.
water contracts when it freezes
heat can cause minerals to oxidize
rocks usually melt in the hot sun
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When wet rocks dry out, they can crack and break. This process, called slaking, is an example of what?
chemical weathering
physical weathering
water erosion
wind erosion
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In which of the following locations would chemical weathering happen most quickly?
Amazon rainforest
Sahara desert
North Pole
Great Plains
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Which of the following is an example of chemical weathering?
A river carrying dirt into a lake.
Wind carrying sand from a beach.
Chemicals in water dissolving minerals in rock.
Friction between two rock surfaces grinding away minerals.
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Choose all the answers that apply.
Erosion:
can damage aquatic ecosystems
removes fertile topsoil
can decrease revenue from agriculture
is caused mainly by wind and water
is the breakdown of rock and other material
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Choose all the answers that apply.
Erosion can be reduced by:
contour plowing
putting up fences
planting trees
removing topsoil
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Which of the following statements is true?
Since the Dust Bowl, erosion has not been a problem in the United States.
The most fertile part of soil is found a few feet below the surface.
Runoff happens when the ground cannot absorb anymore water.
Oxidation happens when carbonic acid gains electrons from oxygen.
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PLEASE HELP 911
Answer:
given below
Explanation:
1) correct answer is option c)
when the temperature changes it leads to oxidize the mineral which leads to create crack.
2) correct answer is option b)
physical weathering is the process of to crack and break in wet rock.
3) correct answer is option a)
In amazon rainforest the chances of chemical weathering is very high.
4) correct answer is option d)
erosion is the process in which the rock and mineral break down into smaller pieces.
5) correct answer is option c)
planting tree can reduce erosion as tree binds the top layer of soil.
6) true answer is option c)
runoff occurs when no water is absorbed by the soil.
Answer:
One way of using streamlining in daily routine is during the nights to make a planned schedule in which the next day is planned with the objective of optimizing the time of the activities. This planning will allow in life to perform work and recreation activities. In addition this planning will allow schedules in food and sleep are necessary and enough for good health.
Gradually as the result of many intermediate steps is my answer because as life on Earth for example started off with simple atoms making molecules, and as the time went past more complex compounds were be produced. And from there later on unicellular organisms started appearing. Nothing in evolution that I know of happens in a short time, at least from the human perspective.