____ dating can be used to determine the age of something from of years ago


Answer 1


Carbon Dating


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During the early stages of meiosis, two chromosomes in a homologous pair may exchange segments, producing genetic variation in sex cells. This process of exchange is called A) transcription. B) crossing over. C) nondisjunction. D) genetic shuffling.
Changing the pendulum design after the first trial was an example of _____________ to solve the problem presented by the teacher. A) designing the model B) evaluating the model C) identifying the problem D) doing research on the problem

What is the advantage of a photosynthetic organism that can move from place to place


It can move towards the sunlight. 

Which describes the particle or particles that are in the nucleus of anatom? *
1. proton and electron

2.electron only

3.electron and neutron

4.neutron and proton


4. neutrons and protons are in the nucleus

    Nevermind! I don't know if you can delete your answer or not but I saw that mine was wrong. Sorry!

Which of the following is an example of an emergent property?


The emergentproperty is that cell is the basic unit of life, one or more cells combine to form organism. The correct option is A.

What is emergent property?

An emergentproperty is a distinctive feature that an entity acquires after becoming a part of a larger system.

Emergent properties aid in the adaptation of living organisms to their surroundings and enhance their likelihood of survival.

Carrying capacities for all species in an ecosystem's biologicalcommunity are an emergent phenomenon of the ecosystem in its entirety because each species' food supply is a result of what happens in other parts of the ecosystem.

In the given scenario, cells being the basic fundamental structural unit of life, is forming a complete organism. This property of cell is indicating the emergent property.

Thus, the correct option is A.

For more details regarding emergent property, visit:



Your question seems incomplete, the missing options are attached in the image below:


When gears and other structures are assembled into a bicycle, the entire assembly can propel the rider.

Hope this helps :)

AP biology questions are very hard. What book should my student be using as a reference?



honestly, it is all up to your preference if you are the tutor or the teacher. It depends on if the student wants to go really in-depth with their work and memorize all the small details, or to know the basics


Final answer:

There are several books that can serve as helpful references for AP biology, including 'Campbell Biology', 'Barron's AP Biology', and 'Cracking the AP Biology Exam'.


When it comes to preparing for AP biology, there are several books that can serve as helpful references. One highly recommended book is 'Campbell Biology' by Jane B. Reece, which is widely used in high school AP biology courses. Another popular book is 'Barron's AP Biology' by Deborah T. Goldberg, which provides comprehensive coverage of the AP biology curriculum. Finally, 'Cracking the AP Biology Exam' by The Princeton Review offers strategies, practice exams, and detailed explanations to help students succeed on the AP biology exam.

Learn more about AP biology books here:



In the 1950s, when Watson and Crick were working on their model of DNA, which concepts were well accepted by the scientific community?


Wilkins and FranklinName: Maurice Wilkins and Rosalind Franklin
Date: 1951
- Wilkins was working with a technique called X-ray diffraction: a technique that involved aiming X rays at the DNA molecule
- Franklin took the now famous Photo 51 and collected data eventually used by Watson and Crick
- Photo 51 indicated that DNA was a double helix, or twisted ladder shape, formed by two strands of nucleotides twisted around each other
- The specific structure of the DNA double helix was determined later by Watson and Crick when they used Franklin's data and other mathematical data

Final answer:

In the 1950s, several key concepts related to DNA were well understood in the scientific community, such as the polymer structure of DNA, base pairing rules, and the helical structure of the molecule itself. The established methods like X-ray crystallography also contributed to their research.


In the 1950s, when Francis Crick and James Watson were working on their model of DNA, the scientific community had a well-established understanding of several key concepts. For example, it was well accepted that DNA is a polymer of nucleotides, each containing deoxyribose sugar, phosphate group, and one of four nitrogenous bases, A, T, C, and G; and that purines always pair with pyrimidines.

X-ray crystallography was an accepted method for investigating molecular structure. Chargaff's rules, which state that of the four types of nucleotides present in a DNA molecule, two were always present in equal amounts, were also widely accepted. Finally, it was known that the DNA molecule has a helical structure, thanks to the work of Rosalind Franklin.

Learn more about DNA Concepts in 1950s here:



Trace the blood flow beginning with the right atrium to the 5th digit of the right hand and back again. Use the terms below.


Right Atrium - Tricuspid Valve - Right Ventricle - pulmonary semilunar valve - pulmonary artery - lungs (arterioles, capillaries, venules), Pulmonary vein, Left atrium, bicuspid valve, left ventricle, aortic semilunar valve, aorta, left subclavin artery, left axillary artery, left brachial artery, arterioles, capillaries, venules, left brachial vein, left axillary vain, left subclavin vein, (superior?) vena cava, right atrium