Answer:
The neurulation process involves two steps: Primary neural induction and Secondary neural induction.
Explanation:
Neurulation may be defined as the process of formation of neural tube from the neural plate. Neurulation starts when the notochord induces the formation of central nervous system.
Two main stages of neurulation are:
Primary neural induction: Primary neurulation is the process of transformation of flat neural plate into circular neural plate. Gene products gradient determines the induction of neural plate.
Secondary neurulation: The medullary cord is formed by the neural ectoderm and endoderm. Cavites formed from the medullary cord changes into the single neural tube.
Answer: When Ionic bonds involve a cation and an anion. The bond is formed when an atom, typically a metal, loses an electron or electrons, and becomes a positive ion, or cation. Then ions produced are oppositely charged and are attracted to one another due to electrostatic forces.
Explanation:
Answer:
Because it is a mode for reproduction and growth.
Explanation:
Cell division is important for both single-celled as well as multi-cellular organisms.
In single-celled organisms, the cell division is the process which helps them to reproduce and form new organisms.
In multi-cellular organism, the cell division becomes more important because both, the division and growth in cells of multi-cellular organism occurs by means of cell division. When cells divide, the number of cells increases and it is seen as a overall growth in the organism. Damaged tissue repair is also accomplished by the cell division itself.
Answer:
Continental <u>Polar</u>
Explanation:
Air masses are given a <u>two-part name</u> that describes the humidity and temperature characteristics of the region where they form. The first part of an air mass’ name describes its humidity. Air masses that form over the ocean, called maritime air masses, are more humid than those that form over land, called continental air masses. The second part of the name describes the temperature of the air mass, which depends on the latitude where it formed. Air masses that form near the equator or in the tropics (equatorial or tropical air masses) are warmer than air masses that form in polar areas or uin the Arctic (polar or arctic air masses).
The word that describes humidity (maritime or continental) is paired with the word that describes temperature (equatorial, tropical, polar or arctic). For example, if an air mass forms over a tropical ocean, it is called maritime tropical. If an air mass forms over land in the far north it is called continental polar.
Energy is the ability to do work. The form of energy that living things need for these processes is chemical energy, and it comes from food. Autotrophs make their own food. Heterotrophs obtain food by eating other organisms. Organisms mainly use the molecules glucose and ATP for energy.
Explanation:i hope this is correct
