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Cerrena [4.2K]
3 years ago
7

Which statement correctly describes an interaction of the respiratory and

Biology
1 answer:
iVinArrow [24]3 years ago
3 0

Answer:

A. Carbon dioxide travels from the heart to the lungs in pulmonary arteries

Explanation:

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Life on Earth uses only two types of energy for metabolism: sunlight and redox chemistry ... One or the other has to be present, and if you're in the habitable zone of a star, you at least have enough light to support photosynthesis. So you have the right temperature, water, and sunlight. What else do you need?

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You have learned that the fusion of egg and sperm produces a zygote. But how does the sperm reach the egg, and how does the zygo
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Answer:

Pollen grain lands on stigma

Explanation:

A) Pollen grain lands on stigma

  • pollen tube grows down the style
  • generative cell divides, forming two sperm
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B)

  1. During pollination, a pollen grain is transferred from an anther to a stigma. Once the pollen grain lands on a suitable stigma, it germinates and forms a pollen tube, a structure that grows down through the style to the ovary.
  2. Once in the pollen tube, the generative cell from the pollen grain divides by mitosis, forming two sperm. The sperm travel down the pollen tube and are discharged into the female gametophyte. In a process called double fertilization, one sperm fertilizes the egg, forming the zygote; the other sperm fuses with two polar nuclei in the female gametophyte, forming a triploid (3n) nucleus. The zygote develops into the plant embryo, and the triploid nucleus divides and gives rise to the endosperm. Double fertilization prevents the waste of the plant's resources by ensuring that the nutrient-rich endosperm only develops if the egg is fertilized.
  3. After double fertilization, the ovule starts to develop into a seed containing the plant embryo. As the embryo develops, the three tissue systems are established, and the cotyledons (seed leaves) form. The seeds of many species dry out as they mature. These dry seeds lie dormant until suitable germination conditions occur.

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The electron density of a polar bond accumulates towards one end of the bond, causing that end to carry a slight negative charge and the other end a slight positive charge. Likewise molecules in which there is an accumulation of electron density at one end of the molecule, giving that end a partial negative charge and the other a partial positive charge, are called polar molecules.

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