B. ventricles
The chordae tendinae, also referred to as heart strings, are tendons that connect the atrioventricular (tricuspid) valves to the muscular wall of the heart. These chords are made predominantly of collagen, while the remaining part is elastin. They play the vital role of maintaining the structure of the valves they connect to. Due to the high pressure generated within the heart, it is entirely possible for the atrioventricular valves to turn inside out. The chordae tendinae prevent this from happening and keep the valves functioning properly.
Answer:
- law of superposition - Relative Dating
- important method for geologists - Absolute Dating, Relative Dating
- places historical events in their correct order - Relative Dating
- establishes how many years ago a given event took place - Absolute Dating
- radioactive decayused on rock strata - Absolute Dating
Explanation:
Absolute dating is an important process used by geologists. This process allows geoologists to determine the timing of a given factor in the environment. In other words, absolute dating allows a numerical age to be estimated for that factor or the age interval between factors, but without putting the factors' formation events in order. It is generally used to date chemical and physical elements present in artifacts and rocks.
Relative dating is also an important process for geologists, but it does provide a relative order of past events and does not provide a numerical age, like absolute dating. It is generally used to date rocks, surface deposits and fossils, often using the law of superposition as a basis.
Answer:
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Answer:
C.
Explanation:
The small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for Huntington's disease. Genetic drift, along with natural selection, mutation, and migration, is one of the basic mechanisms of evolution. In this case, it was a chance that the settlers all carried the allele for Huntington's disease.
Answer:
Covalent bonds appear inside every linear chain and connect bases, sugars, and phosphate groups.
Hydrogen bonds appear between two strands and involve the base from one strand with the base from another strand in the complementary pairing.
Explanation:
A covalent bond is a chemical bond formed by joining electrons of two non-metal atoms into one or more common pairs.
A hydrogen bond (X-bond) is a type of weak chemical bond based on electrostatic attraction between a hydrogen atom and a nucleophilic atom that contains free electron pairs.
