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2 years ago

Refer to figure 10.13. Which photos (A-I) best illustrate the methods of fossilization or fossil evidence listed below

Biology

1 answer:

erastova [34]2 years ago

7 0

Answer:

Permineralization:

A. Trilobite fossil

F. Trilobite fossil

B. Fossilized wood

Cast:

G. Fossil dung

Carbonization:

C. Fossil bee

I. Fossil fish

Impression:

D. Fossil brachiopods

Amber:

H. Fossil spider

Indirect impression:

E. Dinosaur track

G. Fossil dung

Explanation:

Permineralization:

The most common process of fossilization in which the remains of the organism, particularly, the internal cavities are replaced by the deposition of minerals carried by water or sediment.

Cast:

Casts are formed when the actual remains and bones of the organism are dissolved, creating a depression or a mould that gradually fills with sediments to form a cast of the exact shape of the original.

Carbonization:

The fossilization process in which only the residual carbon of the living organism remains leaving behind a thin carbon layer.

Impression:

Fossilization that involves the preservation of the prints or impressions of animals and plants when the print is made in silt or mud. This mud or silt hardens to rock.

Amber:

Amber is living organism preserved in fossilized tree resin.

Indirect Impression:

Indirect impressions are two dimensional imprints that do not contain any organic material from the organism itself but give a clue of its existence and biological activity. Footprints, tracks and excrement is fossilized in this manner.

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Antibodies are composed of two types of peptides, heavy chains and light chains. One of the major classes of antibody molecules

timurjin [86]

Answer and Explanation:

a. form the antigen-binding site ⇒ both chains

The antigen-binding site is formed by one hypervariable region of the light chain (VL) and one hypervariable region of the heavy chain (VH). So, both type of chains contributes to antigen recognition.

b. contain multiple variable domains ⇒ none

Both chains - light and heavy - contain <u>only one</u> variable domain (VL and VH).

c. are found in the Fab fragment ⇒ both chains

The Fab fragment is composed of portions of both light and heavy chains: each portion contains one variable domain and one constant domain. The Fab fragment binds specifically the antigen.

d. are found in the FC fragment ⇒ heavy chains

The Fc region is composed of portions of heavy chains (CH² and CH³), so it contains constant domains.

e. contain only one constant domain ⇒ light chains

Each light chain contains one variable domain (VL) and one constant domain (CL).

f. contain multiple constant domains ⇒ heavy chains

Each heavy chain contains three constant domains: CH¹, CH² and CH³.

g. contain only one variable domain ⇒ both chains

Both light and heavy chains contain one variable domain. The difference is given by the number of constant domains: light chains have 1 constant domain while heavy chains have 3 constant domains.

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2 years ago

If natural selection has no foresight, how can it explain features that seem to prepare organisms for future events? for example

Nezavi [6.7K]

The genes in a population give forth the genetic variability across a population (genotypes). In addition, occasional mutations of these genes in a population increase this genetic variability. Hovever, natural selection only favours reproduction of individuals with genes that are favourable in the environment/habitat. Therefore, natural selection has no foresight but is rather pegged on being an ‘opportunistic’ process.

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2 years ago

Protist taxonomy has changed greatly in recent years as relationships have been re-examined using newer approaches. How do newer

Elis [28]

Answer:

The protists refer to the unicellular eukaryotic species, which comprise algae, fungi, and protozoa. Of these some are autotrophs and some are heterotrophs. They exhibit the tendency to survive in aquatic surroundings because of their feeding habits.

In older approaches, protists are categorized on the basis of their morphology. However, by using novel approaches like molecular genetics, they are being categorized on the basis of their genetics.

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2 years ago

______________ sources of water pollution are relatively easy to monitor and regulate while __________ sources of water pollutio

gtnhenbr [62]

Answer:C. Point, nonpoint

Explanation:

Point source of water pollution originate from a single source and the source of origin can be determined. Industrial and sewage drainage systems are the examples of point source pollutants. The source of pollutant is easy to detect and monitor.

Non-point source of water pollution the source of pollution remains undetermined. The pollutants may enter in water body through multiple sources. Hence, it is difficult to track back the source of single pollutant. Thus non-point source pollution cannot be clean and monitored.

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2 years ago

Coach Damien notices that some of his football players drink more water than others before Friday night games. He is interested

max2010maxim [7]

The independent variable is the amount of water consumed by the football players.

The dependent variable is the football players' endurance, measured by how many times they can run up and down the bleachers before catching their breaths.

The coach's hypothesis was that the more water consumed, the more endurance the players will have.

There is not a control group present in this experiment, but it would be the set of players who did not drink a bottle of water before practice.

The experimental group is the set of players who did drink a bottle of water before practice.

The constants in the experiment are the operational definitions of endurance (how he measures their endurance), the amount of water each player drinks throughout the week, and the players used in the experiment.

The lack of a set control group poses a threat to the accuracy of the experiment's results.

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2 years ago

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