Answer:
d. sustainable
Explanation:
The wild populations of animals and plants are considered sustainable natural resources since a controlled exploitation of these species may ensure their continuity in nature. For example, habitat fragmentation is one of the major causes of a reduction in the population size of the cheetah as they need a large territory. However, the protection and conservation of natural habitats of Cheetah ensure that the species is not extinct in the near future. Therefore, the cheetahs are a sustainable natural resource.
Answer: Basically groundwater is created when precipitation seeps into the soil, so if there was a drought and it hardly rained, the groundwater could be considered an unrenewable resource until it rained again.
Explanation:
D
Embryonic stem cells are capable of self-renewal and unlimited differentiation.
Explanation:
An embryo is at the earliest stages in the growth and development of a higher organism. The cells of an embryo are pluripotent meaning that at the stage, they can differentiate into any type of cell of the organism. Therefore these cells are not determined and are referred to as stem cells. These cells are also self-renewing meaning that the cells can divide more stem cells.
Over time, these cells will begin to differentiate into tissues, organs, organ systems and ultimately into the whole organism. Some of the cells like the nerve,blood and muscle cells will also lose their self-renewal capacity.
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For more on stem cells check out;
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-Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.
The movement of nutrients into the vascular stele requires energy, unlike the movement of water that does not require energy. This energy is provided by the phloem. Sugars are produced in the leafs, as part of the photosynthesis process, so whenever a new root is growing, or a fruit needs to grow, the phloem gets in action. With the help of the water the sugars get in the phloem, which can most simply be seen as an elevator inside the plant, that is moving nutrients up and down, on the places in which they are most needed.
