Answer:
cell walls and chloroplasts
Answer:
These fossils indicate that North America must have had a much warmer (i.e a tropical environment 370 million years ago)
Explanation:
Corals are marine animals whose skeletons are easily fossilized and thus have an extensive fossil record. There are many fossils of extinct corals in North America. For example, Lophophyllum is a North American extinct genus of corals dated at 320 million to 290 million years ago (i.e., from the Late Carboniferous period). In general, corals live in warm seawater, and thereby their fossil records can be used as indicators of environmental conditions.
The coral fossils' presence suggests that North America was located near the equator 370 million years ago, within the subtropical climate zones where corals thrive the most.
These seasonal changes in density create growth rings, similar to those found on trees. Scientists can use these rings and other features to determine the climatic conditions during the growing season of the coral.
By comparing the soil and plant and animal evidence at a site, scientists can get a general idea of what the environment was like in the past. By comparing living plant and animal evidence to these ancient remains, scientists can get an idea of what the environments were like.
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Answer:
No, since different genes will exert varying degrees of influence on the trait
Explanation:
The term quantitative heritability refers to the transmission of a phenotypic trait in which expression depends on the additive effect of a series of genes.
Polygenic heritability occurs when a trait results from the interaction of more than one gene. And these genes can also have more than two alleles. The action of many genes and alleles can cause many different combinations that are the reason for genotypic graduation.
Quantitative traits are those that can be measure, such as longitude, weight, eggs laid per female, among others. These characters do not group individuals by any precise and clear categories. Instead, they group individuals in many different categories that depend on how the genes were intercrossed and distributed during meiosis. The result depends on the magnitude in which each allele contributes to the final phenotypeand genotype. When they interact, they create a gradation in phenotypes, according to the level of contribution.
Let us see, for instance, the eye color trait, which results from the interaction of many genes. Two of them significantly contribute to the color green, blue, or brown, while the rest of the involved genes play a role in defining the spectrum of phenotypes of each eye color. So, there are different tones of blue eyes, green eyes, and brown eyes, and the differences are determined by the contribution of each allele to the phenotype.
In polygenic inheritance, multiple genes influence a trait, and theycan have varying degrees of influence rather than having the exact same effect.
In polygenic inheritance, it is not accurate to say that all genes controlling a trait will have exactly the same influence over the trait. Polygenic inheritance involves multiple genes that work together to influence a trait. This means that these genes do not necessarily exert the same degree of influence; rather, they can and often do exert varying degrees of influence on the expression of a trait. For example, in human skin color, a characteristic feature of polygenic inheritance, several genes, each with different levels of influence, contribute to the trait's expression.
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b. a river contaminated with the Giardia protozoan
c. a doorknob contaminated with the cold virus
d. an asymptomatic person infected with HIV
e. a mosquito infected with the malaria protozoan
Answer:
The correct option is: c. a doorknob contaminated with the cold virus
Explanation:
Fomites are the inanimate objects or substances that can get contaminated with the pathogens and are capable of transferring the pathogens to the new hosts.
Sterilization of the possible fomites should be done in order to prevent cross-infection.
Examples of fomites are hair, towels, clothes, door knobs, cups, switches, handrails, remote controls, pens, syringes, bedding, etc.
Answer:
yes
Explanation:
some the bacteria are resistance to antibiotics due to mutation.
Answer:
c the hatching of eggs by birds
Explanation:
it is using the same way as the heating
The terrestrial planets represent characteristics of the four planets that are closest to the sun. Therefore, the correct option is A.
The solar system contains 4 planets that are closest to the sun. These planets are Mercury, Venus, Earth, and Mars. These planets are called terrestrial planets. Like Earth, these planets are rocky and have the same composition and structure. Hence, they are also called telluric planets.
Typically, these planets have a metallic core made primarily of iron and a silicate mantle. On their surface, they have topological characteristics like mountains, valleys, craters, etc.
Terrestrial planets have a secondary atmosphere, as opposed to large planets, which have a main atmosphere. It is well known that terrestrial planets have few or no satellites of their own. For instance, the Earth has just one satellite, but Mars has two, and Venus and Mercury both have none. Therefore, the correct option is A.
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The question is incomplete, but most probably the complete question is,
Which of the following represents characteristics of the four planets closest to the sun?
1. Terrestrial planets
2. Giant planets
3. Dwarf planets
4. Gas planets
Answer:
they are hot or can get hot