Darby finds a rock in her backyard. It has large crystals. She has found _____.-an extrusive igneous rock
-an intrusive igneous rock
-basalt
-obsidian

Answers

Answer 1

Answer: The right answer for the question that is being asked and shown above is that: "-an extrusive igneous rock." Darby finds a rock in her backyard. It has large crystals. She has found -an extrusive igneous rock

Answer 2

Answer:

Darby has found an extrusive igneous rock in her backyard.

... Lucky her.

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What did Thomas Hunt Morgan discover?

Answers

Thomas Hunt Morgan hoped to discover large-scale mutations that would represent the emergence of new species.

1910

Thomas Hunt Morgan (1866-1945) establishes the chromosomal theory of heredity

Thomas Hunt Morgan, an embryologist who had turned to research in heredity, in 1907 began to extensively breed the common fruit fly, Drosophila melanogaster. He hoped to discover large-scale mutations that would represent the emergence of new species. As it turned out, Morgan confirmed Mendelian laws of inheritance and the hypothesis that genes are located on chromosomes. He thereby inaugurated classical experimental

After breeding millions of Drosophila in his laboratory at Columbia University, in 1910 Morgan noticed one fruit fly with a distinctive characteristic: white eyes instead of red. He isolated this specimen and mated it to an ordinary red-eyed fly. Although the first generation of 1,237 offspring was all red-eyed but for three, white-eyed flies appeared in larger numbers in the second generation. Surprisingly, all white-eyed flies were male.

These results were suggestive for hypotheses of which Morgan himself was skeptical. He was at the time critical of the Mendelian theory of inheritance, mistrusted aspects of chromosomal theory, and did not believe that Darwin's concept of natural selection could account for the emergence of new species. But Morgan's discoveries with white- and red-eyed flies led him to reconsider each of these hypotheses.

In particular, Morgan began to entertain the possibility that association of eye color and sex in fruit flies had a physical and mechanistic basis in the chromosomes. The shape of one ofDrosophila's four chromosome pairs was thought to be distinctive for sex determination. Males invariably possess the XY chromosome pair (Morgan used a more cumbersome notation) while flies with the XX chromosome are female. If the factor for eye color was located exclusively on the X chromosome, Morgan realized, Mendelian rules for inheritance of dominant and recessive traits could apply.

In brief, Morgan had discovered that eye color in Drosophilaexpressed a sex-linked trait. All first-generation offspring of a mutant white-eyed male and a normal red-eyed female would have red eyes because every chromosome pair would contain at least one copy of the X chromosome with the dominant trait. But half the females from this union would now possess a copy of the white-eyed male's recessive X chromosome. This chromosome would be transmitted, on average, to one-half of second-generation offspring—one-half of which would be male. Thus, second-generation offspring would include one-quarter with white eyes—and all of these would be male.

Intensive work led Morgan to discover more mutant traits—some two dozen between 1911 and 1914. With evidence drawn from cytology he was able to refine Mendelian laws and combine them with the theory—first suggested by Theodor Boveri and Walter Sutton—that the chromosomes carry hereditary information. In 1915, Morgan and his colleagues published The Mechanism

• Discrete pairs of factors located on chromosomes like beads on a string bear hereditary information. These factors—Morgan would soon call them genes—segregate in germ cells and combine during reproduction, essentially as predicted by Mendelian laws. However:

• Certain characteristics are sex-linked—that is, occur together because they arise on the same chromosome that determines gender. More generally:

• Other characteristics are also sometimes associated because, as paired chromosomes separate during germ cell development, genes proximate to one another tend to remain together. But sometimes, as a mechanistic consequence of reproduction, this linkage between genes is broken, allowing for new combinations of traits.

Morgan's experimental and theoretical work inaugurated research in genetics and promoted a revolution in biology. Evidence he adduced from embryology and cell theory pointed the way toward a synthesis of genetics with evolutionary theory. Morgan himself explored aspects of these developments in later work, includingEvolution and Genetics published in 1925, and The Theory of the Gene in 1926. He received the Nobel Prize in Physiology or Medicine in 1933.

John is observing a few slides of a human embryo. The first slide shows a neural tube and the second just a compact mass of cells. Which phases of human embryos are the slides?A. First slide: blastula; second slide: gastrula
B. First slide: gastrula: second slide: neurula
C. First slide: neurula: second slide: morula

Answers

C) first slide : neurula :second side :morula

Which question is most likely to be studied by biologists? What is the effect of exercise on heart rate in horses? How does knowledge of phonics affect reading ability? What is the effect of cooking temperature on the flavor of cake? Does the number of school days affect how much energy the school uses?

Answers

The correct answer is option A

A biologist is a person who has the knowledge in the field of biology. Biology is a multidisciplinary subject that includes ecology, zoology, botany, environmental studies et cetera.

The effect of exercise on the heart rate of horses comes under the category of zoology.

In this subject we study about the effect of various components present in the surrounding on the health of animals.

"What is the effect of exercise on heart rate in horses" because biology is the study of life.

A biology student is using illustrations of a virus, a bacteria, an amoeba, and a human skin cell to show the relative size of these microscopic objects. Which of these is the smallest microscopic object?

Answers

The answer is A: Virus

Work and power are different because (2 points) work involves force and distance while power involves force and velocity. work involves distance and mass while power involves distance and time. work involves energy and time while power involves force and mass. work involves velocity and time while power involves energy and force.

Answers

Work and power are different because work involves force and distance while power involves force and velocity, power involves force and mass

What is force ?

Force refers to an interaction which can change the motion of the unopposed object, it is the push or pull mechanism experienced by any object, is a vector, has both magnitude and direction.

Force can be classified into two types, like Contact Force which can be applied to the objects, three subtypes of forces are Frictional force, Applied force, Normal force.

Non-Contact Force defined as force of the body without any contact, example is Gravitational force. The SI power unit of force is the Newton(N).

Learn more about force , here:

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Work and power are different because work involves force and distance while power involves force and velocity.

Where do many of the cell's metabolic processes take place?a. In the cytoplasm
b. in the nucleus
c. in a vacuole
d. In the cytoskeleton

Answers

D because it goes in and out

Final answer:

Many of the cell's metabolic processes take place in the cytoplasm. The cytoplasm is the area of the cell where general metabolic reactions like protein synthesis, cellular respiration, and waste removal happen.

Explanation:

Many of the cell's metabolic processes occur in the cytoplasm. The cytoplasm is the part of the cell outside the nucleus where a variety of reactions, such as cellular respiration, protein synthesis, and waste removal, occur. The other listed components of the cell – the nucleus, vacuoles, and cytoskeleton, have more specific roles that do not primarily involve general metabolic processes.