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AnnZ [28]
3 years ago
6

This is 7th grade science plz help

Biology
1 answer:
Darya [45]3 years ago
4 0
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientist calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years. 
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With the severe changes to natural environments, many species are coming into contact with other species from which they were on
Artist 52 [7]

Answer:

Postzygotic isolating mechanism

Explanation:

Reproductive isolation can occur due to prezygotic or postzygotic isolating mechanism. Prezygotic mechanism prevents fertilization of gametes and can occur due to different mating behavior, different mating time period etc. Postzygotic mechanism occurs after the formation of zygote i.e. the organisms are able to mate and fertilization also occurs. However the resultant zygote may not survive. It might not survive immediately or might die before reaching the reproductive maturity. Such a situation would still come under reproductive isolation because the resultant offspring is not viable and not able to pass on the genes to the next generation.

6 0
3 years ago
Information gathered from observing the growth of a fish over a month is called Question 2 options: hypotheses. data. variables.
stepan [7]
Data is the answer because it is information that you got from watching the fish.
7 0
3 years ago
Read 2 more answers
Which statements explain how ponds and lakes differ? Select two options.
dybincka [34]

Answer:

A. ponds are shallower than lakes

E. lakes are colder and darker at the bottom than ponds

6 0
3 years ago
Which class of amino acids contains side chains that would be unable to form hydrogen bonds with water?
seropon [69]

Answer:

Amino acids with non-polar side chains.

Explanation:

The class of proteins that is unable to form hydrogen bonds with water are the amino acids with non- polar side chains. This class includes the amino acids

Alanine

Valine

Leucine

Isoleucine

Proline

Phenylalanine

Cysteine

Methionine

Tryptophan

These are the nine proteins which are considered to be strongly hydrophobic. All these amino acids are hydrophobic in nature due to their side chains. Glycine is not added to this list as it does not have a side chain.

6 0
3 years ago
Photosynthesis is the main method by which primary production takes place in an ecosystem. What abiotic factor is a beneficial b
iris [78.8K]

Oxygen is an abiotic factor that is beneficial by-product of primary production.

<u>Explanation:</u>

The non living parts of an ecosystem that mainly affects the living organisms in it are called as an abiotic factor. These can include soil, temperature, water, oxygen and sunlight. The major energy source in earth is Oxygen which is abiotic factor.

It is very essential for the photosynthesis process to take place. Here, the plants converts water and carbon dioxide into oxygen and sugar. This becomes food for plants. Then these plants are eaten by animals. Thus oxygen is an important and beneficial by-product of photosynthesis. Oxygen is also very important for the survival of human beings.

5 0
3 years ago
Read 2 more answers
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