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vladimir2022 [97]
4 years ago
11

What must happen before a chemical reaction can begin?

Biology
1 answer:
shepuryov [24]4 years ago
8 0
The answer is B. A chemical reaction consists of an endothermic stage (energy taken in to break chemical bonds) followed by an exothermic stage (energy released as bonds are formed). The first stage requires this energy input, which is the activation energy. When the activation energy is reached or exceeded, the reaction will occur. Therefore as soon as this threshold is REACHED, it happens
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Scientists classify organisms in groups based on:
dmitriy555 [2]
The answer is I, evolutionary phylogeny; It is based on the phylogeny of organisms which is determines the similarities and differences in their physical or genetic characteristics. A phylogenetic tree or evolutionary tree is used which shows the inferred evolutionary relationships among various biological species or other entities. 
6 0
3 years ago
Idk which go in which
Margarita [4]
Carries genetic info wont be one for anything here.
6 0
3 years ago
Summarize the process of photosynthesis.
romanna [79]
Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water.
8 0
3 years ago
Suppose you discover two interesting rare cytological abnormalities in the karyotype of a human male. (A karyotype is the total
sdas [7]

Answer:

1/8.

Explanation:

Karyotype may be defined as the visual appearance and the number of chromosome of the organism. Karyotype helps in studying the chromosomal abnormalites.

The human male has extra piece at chromosome 4. The abnormal pattern on the chromosome 7. The probability to inherit the defective chromosome 4 is 1/2, defective chromosome 7 is 1/2 and the probability of Y chromosome is 1/2. The probability of child to inherit all these chromosome is (1/2) × (1/2) × (1/2) = 1/8.

Thus, the answer is 1/8.

7 0
3 years ago
An earthquake that occurs near a river system weakens the walls of dams that beavers have built and the dams collapse. If anothe
denis23 [38]

Answer:

o The beavers will not have a suitable habitat available and will gradually decline in number.

Explanation:

According to this question, an earthquake that occurs near a river system weakens a dam wall built by beavers, which are aquatic rodents, and causes the dam to collapse. This initial earthquake will damage the habitat of these aquatic animals (beavers), which is barricaded by the walls built by them around the dam over time.

The walls prevent the constant flow of water but when the walls of the dam collapses, the water in the dam begins to flow excessively i.e floods. This causes the loss of habitat of beavers, hence, resulting in the declination of number

5 0
3 years ago
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