How do rates of mutation "power" molecular clocks?

Answers

Answer 1

Answer:

Molecular clocks use rates of mutation to measure evolutionary time. Mutations add up at a fairly constant rate in the DNA of species that evolved from a common ancestor. The more mutations that happened in each lineage, the greater is the differences between these lineages.

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Which of the following was one of the first instruments that prehistoric people probably used?A. Lyres
B. Tambourines
C. Guitars
D. Voices

Answers

Out of the following choices given, the first instrument used by the prehistoric people was their voices. The correct answer is D.

Answer:

Option (D)

Explanation:

From the remains of musical instruments that are collected by the archaeologists, scientists have predicted that the sound was first generated consciously, along with the creation of arts such as wall paintings, clay statuette during the time between 60,000 BC and 30,000 BC.

The human voice was usually considered to be the first musical instrument discovered by humans. In the initial period, people often used their hands to clap so that a clear rhythm can be obtained.

Archaeologists have collected early instruments such as whistles, pipes, and flutes that are made up of wood as well as from the bones of animals. Some of the old instruments include 'Tjurunga' and 'Harp'.

Thus, the human voice was considered to be the first instrument that prehistoric people probably have used.

hence, the correct answer is option (D).

Whats an entire group of muscles that work together called?

Answers

An entire group of muscles that work together is called a synergist.

Water in ocean currents can descend when it becomes colder and saltier thanthe surrounding water. If water descends to the bottom of the ocean, then other
water must rise to the top. What causes water to rise to the top of the ocean?*
It is forced upward by underwater mountain ranges
It cools down and dissolves additional salt
It is brought upward by organisms that live in the ocean
It becomes less dense than the surrounding water

Answers

Answer: D it becomes less dense than the surrounding water

Explanation: when the water becomes colder and saltier it becomes more dense so the less dense water rises to the top.

Which question is most likely to be found in a dichotomous key for identifying a tree by its leaves?

Answers

leaf bases attached opposite to each other on the branch.

What is Dichotomous key?

A dichotomous key is an identification technique that repeatedly divides groups of organisms into two categories.

More details regarding the unique characteristics of a given organism are disclosed with each successive division. Once the organism no longer exhibits all of the chosen traits in concert with any other organism, it has been recognized.

In order to identify specimens with a dichotomous key, it is recommended to employ immutable traits (i.e. features that do not change). Size, coloration, and behavioral habits can all change across people and over the course of a lifetime.

Therefore, leaf bases attached opposite to each other on the branch.

To learn more about Dichotomous key, refer to the link:

brainly.com/question/2235448

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Answer:

Are the leaf bases attached opposite to each other on the branch? Answer C 2020

Explanation:

Which of these statements is true about kingdoms? a. The kingdom system is based on the color of the organisms in each group.
b. The kingdom classification system can change based on the discovery of new information and organisms.
c. The kingdom system is made of permanent groups that will not change.
d. The current kingdom system has two main divisions: Plantae and Animalia.

Answers

The correct answer is b. The kingdom classification system can change based on the discovery of new information and organisms.

The kingdom is taxonomic rank, below domain which is divided into smaller groups called phyla. Different kinds of proposed classification changed over time and at the moment the kingdom-level classification of life includes Bacteria, Archea, Protozoa, Chromista, Plantae, Fungi and Animalia.

In contrast to eukaryotic cells, prokaryotic cells

Answers

Eukaryotic cells have DNA enclosed in a nuclear envelope and membrane-bound organelles that carry out various functions. Prokaryotic cells have DNA, but lack a nucleus and don't have any organelles.

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