Homologous chromosomes pair up and exchange segments of DNA.
Option A
<h3><u>Explanation:</u></h3>
Crossing over is an event of Prophase 1 of meiosis 1. It occurs in the zygotene phase of prophase 1. Here the homologous chromosome pairs get very close together and gets packed within protein coat. The enzymes randomly cut the DNA segments from both chromosomes at same loci and exchange them with each other. This results in the exchange of genes between the two chromosomes. This is how the variation comes to place between offsprings of the same individuals. The crossing over results to form X shaped intersections between homologous pair of chromosomes which is called as chaismata. This phase occurs in pachytene phase and is visible in diplotene phase when the protein coat dissolves.
Answer:
is 26.25 N
Explanation:
Given that: 
= 20 N, 
= 17 N.
This implies that the two forces are acting at right angle to each other. Thus applying the Pythagoras theorem, we have;
= 
= 
= 
= 
= 26.2488
= 26.25 N
The net force is 26.25 N.
States enjoyed greater autonomy under the Articles, whereas the Constitution granted some powers to the states.
<h3>What is articles of confederation?</h3>
- The 13 founding states of the United States of America came to an agreement known as the Articles of Confederation and Perpetual Union, which functioned as the country's first system of governance.
- On November 15, 1777, the Second Continental Congress approved it following lengthy discussion and forwarded it to the states for ratification.
- In the Articles of Confederation, which served as the nation's first constitution, the confederacy of the former 13 colonies was referred to as "The United States of America."
- The 13 articles that made up the Articles of Confederation granted authority to a federal government headed by Congress.
- Following the United States' declaration of independence from Great Britain, the national government's functions were codified in the Articles of Confederation.
- The Continental Congress approved the Articles of Confederation on November 15, 1777.
- This text functioned as the first constitution of the United States.
- It lasted from March 1, 1781, until the current Constitution took effect in 1789.
Learn more about the articles of confederation here:
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Answer: b. Remains of formerly living things buried by sediments in regions with little oxygen.
Explanation:
Fossil fuels are underground geological fuel deposits which are formed from the decaying of organic materials (animals and plants) over hundreds of millions of years in the earth's crust, which furthur processed into coal, crude oil, heavy oils or natural gas by exposure to pressure and heat
Fossil fules are present only in sedimentary rocks under litte oxygen the provide temperatures and pressures that do not kill fossil remains, unlike most igneousand metamorphic rocks.
Hence, the correct option is b.
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