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.
Answer: The correct answer is- C.
Carrying capacity can be described as the maximum number of organisms belonging to a particular species that can be sustained by resources present in the area.
Due to the presence of limiting factors ( such as food, water, weather conditions), the size of a population usually stays near its carrying capacity.
This is because initially population experience rapid growth but later on due the limiting factor ( environmental factor that causes decline in the population) it will decline and then stabilize near the carrying capacity.
Thus, population size stays near the carrying capacity because of limiting factors.
EGG, and SPERM
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Answer:
1. Ms. Frizzle’s kids trap air in containers and discover that air is pushy stuff.
2. How do you know that air is real? (One way: Feel wind, breath.)
3. The students explore how air pressure can hold up heavy objects.
4 and 5 are attached in an image below.
Explanation:
the island is a small specie of lizards so if the mainland specie was a large population it would have been the one to be affected by an increase instead of a decrease. The genetic drift was caused by not having enough of the same kind to keep the heredity going, most likely the largest population is the one that had enough of the same heredity to keep the population of lizards going. In a way the hurricane with the force on both species caused a genetic drift but increased a larger population for a year later.
