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Scrat [10]
3 years ago
8

Which ranks the terms in order of increasing size and the number of space objects contained within? Size: universe galaxysolar s

ystem Number of objects: universe galaxysolar system Size: solar systemgalaxyuniverse Number of objects: universegalaxysolar system Size: universegalaxysolar system Number of objects: solar systemgalaxyuniverse Size: solar systemgalaxyuniverse Number of objects: solar systemgalaxyuniverse
Biology
2 answers:
RoseWind [281]3 years ago
7 0

the coorect answer is option D

Nat2105 [25]3 years ago
3 0
The order goes Solar system, Galaxy, Universe for both the size and the number of objects.
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Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesions. Such molecules must
scoundrel [369]

Answer:

1. They must be removed before sister chromatids or homologous chromosomes can separate

Explanation:

During the S-phase of the cell cycle, not only does DNA have to be replicated, but also newly synthesized DNA molecules have to be connected with each other. This replicated DNA (sister chromatids) remain physically connected with each other from S phase until metaphase. This physical connection is called Sister chromatids cohesion.

Sister chromatid cohesion depends on COHESIN, a tripartite protein complex that forms a ring structure to hold sister chromatids together during mitosis and meiosis. Cohesin regulates the separation of sister chromatids during cell division, either mitosis or meiosis. This sister chromatid cohesion is essential for the biorientation of chromosomes on the mitotic or meiotic metaphase spindle, and is thus an essential prerequisite for chromosome segregation. Without the cohesion, sister chromatids would not be segregated symmetrically between the forming daughter cells, resulting in aneuploidy.

Cohesion is established during S-phase of DNA replication, and the cohesins hold the sister chromatid together after DNA replication until anaphase when the removal of cohesin leads to separation of sister chromatids (meiosis II and mitosis) and homologous chromosomes (meiosis I).

8 0
3 years ago
Fermentation is carried out regularly, and not only during oxygen emergencies, by what organisms?
PolarNik [594]
The answer is B. many fungi and bacteria
3 0
3 years ago
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Name two things that increase the amount of nitrogen in the nitrogen cycle
Allushta [10]

The majority of Earth's atmosphere contain 78% is nitrogen, The Nitrogen cycle is the geochemical cycle in which nitrogen is converted into multiple chemical forms. Nitrogen cycle occurs in terrestrial and marine ecosystem. Nitrogen can be converted through both biological and physical process. The processes that are involved in nitrogen cycle are fixation, ammonification, nitrification, and denitrification.

There is limited amount of nitrogen that is useful but <u>increase of fossil fuel combustion, use of artificial nitrogen fertilizer</u> have dramatically increased the amount of nitrogen in nitrogen cycle.

8 0
3 years ago
What index provides evidence of when different types of life evolved on Earth?
aev [14]

There are all sorts of ways to reconstruct the history of life on Earth. Pinning down when specific events occurred is often tricky, though. For this, biologists depend mainly on dating the rocks in which fossils are found, and by looking at the “molecular clocks” in the DNA of living organisms.

There are problems with each of these methods. The fossil record is like a movie with most of the frames cut out. Because it is so incomplete, it can be difficult to establish exactly when particular evolutionary changes happened.

Modern genetics allows scientists to measure how different species are from each other at a molecular level, and thus to estimate how much time has passed since a single lineage split into different species. Confounding factors rack up for species that are very distantly related, making the earlier dates more uncertain.

These difficulties mean that the dates in the timeline should be taken as approximate. As a general rule, they become more uncertain the further back along the geological timescale we look. Dates that are very uncertain are marked with a question mark.

4 0
3 years ago
The dichotomous key (ERGENT HELP)
kolezko [41]

Answer:

D. asks multiple questions about how organisms behave and act.

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