_____ are chemical mechanisms that start a reaction.Inhibitors

Activators

Centrioles

Vacuoles

The Earth has three main climate zones because of the differences in latitude and the distribution of sunlight.

Further explanation

Climate is the average weather conditions in an area for over a long period. Three major climate zones on Earth are:

1. Polar zone

The characteristic of this polar climate is cool summer and long extremely cold winter. The polar climate has a freezing climate and most of the time below zero degrees. The farther north of Canada, Europe, and Russia are the area that categorizes in this polar zone.

2. Temperate zone

The temperate climate zone lying between 23.5 degrees and 66.5 degrees north and south latitudes. Temperate climate zones experience warm to hot summers and cool winters, with the greatest temperature variations throughout the year.  

3. Tropical zone

The regions between the equator and the tropics are tropical zone. In this zone, the temperature is warm, has the most rain and little temperature variation. The climate is hotter here because the Sun’s light is directly overhead at the equator. An area in this zone has lush plants and trees and varied animals.  

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Characteristic of each climate zone brainly.com/question/16218

Temperate zone brainly.com/question/1176545

Factors of climate zone brainly.com/question/1112371

Keywords: climate zones, polar zone, tropical zone, temperate zone

Answer;

Embryonic period

Explanation;

The germinal stage is the period of gestation from fertilization or conception, when the egg meets the sperm, to implantation of the embryo in the uterus. The embryonic stage of gestation is the period after implantation, during which all of the major organs and structures within the growing mammal are formed.

-Embryonic period begins at fertilization (penetration of the egg by the sperm) and continues until the end of the 10th week of gestation (8th week by embryonic age). The period of two weeks from fertilization is also referred to as the germinal stage.

Final answer:

Mitosis in animal and plant cells end differently; with furrowing in animal cells and the formation of a cell plate in plant cells. Plant cells also maintain chromosomal integrity throughout the process.

Explanation:

Mitosis in animal cells and plant cells have a different conclusion. In animal cells, cytokinesis occurs through a process called furrowing, where the cytoplasm is pinched into two. On the other hand, plant cells undergo cytokinesis through the formation of a cell plate which eventually develops into a cell wall separating the two daughter cells. Also, unlike animal cells, plant cells maintain chromosomal integrity throughout the process.

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Correct Answer is (3)

Explanation:

    (3) In order to survive, all organisms must carry out enzyme-controlled reactions.

• Enzymes is the Most of the responses that happen in living life forms are chemical controlled.
• They are along these lines explicit in the responses that they catalyze  one chemical will respond with particles of one substrate.
• The site of the response happens in a territory on the outside of the protein called the active site.
• Enzymes can be influenced by an assortment of elements, for example, temperature, pH, and focus.
• Chemicals work best inside explicit temperature and pH ranges, and imperfect conditions can make a protein lose its capacity to tie to a substrate.
• The most of the enzyme has an optimum pH range.