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Vlad1618 [11]
3 years ago
15

Why are comets visible only when they are near the sun?

Biology
1 answer:
zepelin [54]3 years ago
3 0

Because comets are darker colored so they need light to shine on them to be seen in the dark skies of space.
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Baron Constantin von Economo discovered the involvement of the posterior hypothalamus and the anterior hypothalamus in human ___
Leona [35]

Answer:

Wakefulness and sleep.

Explanation:

Hypothalamus may be defined as the small region of the brain that maintains the homeostasis of the body. The hypothalamus is divided into anterior hypothalamus and posterior hypothalamus.

The anterior hypothalamus of the brain is involved in the sleep activity of the organisms and releases the hormones also. The posterior hypothalamus is involved in the wakefulness of the individual.

Thus, the correct answer is wakefulness and sleep.

3 0
2 years ago
What is the use of protist in biological research?​
oee [108]

Answer:

The protists include plant-like organisms such as algae, animal-like organisms such as amoebas, and fungus-like organisms such as slime molds. They are also very important to us. ... The slime molds are important to ecosystems because they are decomposers, which release vital nutrients back into the environment.

Explanation:

4 0
3 years ago
3. Human skin cells divide at a higher rate than neurons (nerve cells). Hypothesize why this may be.
Katena32 [7]

Answer:

the skin cells prevent germs from coming in our bodies

Explanation:

8 0
2 years ago
Which data would not affect maximum likelihood estimates of phylogenies when comparing different tree hypotheses?.
Solnce55 [7]

The tree topology

The lengths of the branches

The branching order of the tree

Nucleotide substitution rate

These would not affect maximum likelihood estimates of phylogenies when comparing different tree hypotheses.

<h3>What is tree topology?</h3>
  • A unique kind of structure called a tree topology has numerous connected parts arranged like the branches of a tree.

<h3>The lengths of the branches:</h3>
  • Branch lengths are a sign of genetic divergence; the longer the branch, the more genetic divergence has taken place.
  • Usually, we calculate the average number of nucleotide or protein substitutions per site to assess the degree of genetic alteration.

<h3>The branching order of the tree:</h3>
  • The topology of a tree refers to its branching structure.
  • Species (or higher taxa), populations, genes, and proteins are examples of taxonomic units that the nodes represent.
  • A branch is referred to as an edge, and it represents an estimate of the length of time between the evolutionary relationships between taxonomic units.

<h3>What is nucleotide substitution rate?</h3>
  • The instantaneous rate of change from each of the four nucleotides to each of the other four nucleotides is summarized in the nucleotide substitution rate matrix.

To learn more about tree phylogeny visit:

brainly.com/question/8573900

#SPJ4

7 0
8 months ago
All cells have a ____ surrounding them
Mrrafil [7]

All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. The plasma membrane, or cell membrane, is the phospholipid layer that surrounds the cell and protects it from the outside environment. Ribosomes are the non-membrane bound organelles where proteins are made, a process called protein synthesis.

8 0
3 years ago
Read 2 more answers
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