The Gymnosperms and Angiosperms are groups of plants with seed, which means that they don’ t necessary acquire water for fertilization. These groups have made adaptations for sexual reproduction on dry land.
1) Gymnosperms (plants with the seeds are not enclosed in an ovary) have developed over the course of its evolution, structures that solved the main limitations present in the Pteridophytes in relation to sexual reproduction, in the terrestrial environment. The main changes that happened as an evolutionary adaptation to dry land are those on the seeds and pollen. The advantages of the seeds are: the storage tissue which sustains growth and a protective coat of the seeds. Seed is enveloped with the layers of hardened tissue which prevents desiccation. This is what frees reproduction from the need for a constant supply of water. <span>The sperm (male gamete) of gymnosperms</span> is enclosed in a pollen grain. Thi structure is protected from desiccation and can reach the female organs without dependence on water. Gymnosperms also developed structures called cupules to enclose and protect the ovule (the female gametophyte) which will develop into a seed upon fertilization.
2) Angiosperms are a group of plants which protect their seeds within an ovary called a fruit. Angiosperms have special evolutionary adaptations. For example, they produce their gametes in separate organs, usually in a flower, so the fertilization and embryo development takes place inside an anatomical structure. That provides a stable system of sexual reproduction largely sheltered from environmental fluctuations like water need.
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Mitosis is a mechanism in which a single cell separates into two separate cells of daughters. One cell in mitosis? Once splits two similar cells into two. Mitosis is primarily aimed at growth and replacement of depleted cells
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..mmm.... high pressure I guess.....
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and are you sure that the outside will be freaking cold with a freaking sun above ..??..
Eating regular meals establishes healthy eating habits, keeps you energized throughout the day, and can cause you to lose weight. regular eating habits establish healthy eating habits because it's always good to eat regularly. One of the biggest misconceptions to losing weight fast and in a healthy manner is by not eating, that is false. If you eat regular meals you can lose weight perfectly fine. The more calories you eat the more you lose, now i'm not saying eat a million and one candy bars, i'm saying if you eat food that is healthy can get you to lose weight. That also doesn't mean live off of carrots and strawberries for a week! You have to eat normally. So a peanut butter and jelly sandwich, pasta, rice or any kind of meat is the way to lose weight vs eating low calorie anything or a candy bar. Every type of food gives you energy! It all depends what it is too predict how much energy you'll receive or how long it will last. For instance, a candy bar will give you a lot of energy, fast but won't last as long as eating pasta or rice for energy. Eating regular meals does cause you to gain weight but thats a good thing, it gives you energy, muscle and can help you lose weight. Eating regular meals actually does the opposite of causing you to be hungry more often, it keeps you fuller for longer.
