a galaxy cluster is when there is thousands of galaxies that are smoshed together.
Answer:
Industry data show that 59% of HFC 134a ever produced has already been release into the atmosphere (along with 80% of the main HCFC in the market, HCFC 22). According to recent investigations, about 60% of HFC<u> emissions arise from routine leaks from refrigeration and air conditioning.</u>
Explanation:
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The option D is correct :The gametophytes of seed plants are never exposed to the external environment. Unlike spores, The gametophyte in seed plants is often tiny and is kept in the tissues of the sporophyte. The integument refers to the layers of sporophyte tissue that encircle the megasporangium.
seeds carry food reserves that can be used to support a young plant. While spores are distributed by the wind, seeds can be spread by animals. While spores only live a few days, seeds can slumber for weeks or even years. Seeds contain a supply of food in storage, in contrast to spores. If the conditions are right, seeds that have been transported far from the parent sporophyte may germinate and rely on stored nourishment to develop into seedlings. Spores and seeds vary primarily in that seeds have stored nourishment in their endosperm, which allows them to germinate in adverse conditions whereas spores do not, making them more dependent on good conditions for germination.
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Full Question :
Which of the qualities is a major difference between all spore-dispersing and seed-dispersing plants? select all that apply.
A In seed plants, dispersed spores contain a multicellular gametophyte.
B Seed plants disperse gametes and seeds instead of spores.
C The sporophyte of seed plants is photosynthetically independent.
D The gametophytes of seed plants are never exposed to the external environment.
Explanation:
<u>-how long it takes for the voltage-gatedNa+ channels to close at the end of an action potential</u>
Neurons have unique structures which aid in facilitating communication by sending and receiving electrical signals very efficient.
The refractory period describes a period between the initiation of an action potential where Na+ channels are closed, and immediately after the action potential’s peak. Action potentials would require an influx of more positively charged ions; these must be more than a specific threshold in order to have the cells send along more action potentials which helps with figuring out stimulus intensity.
Potassium ions readily diffuse out of the cell more quickly than sodium due to the presence of more channels which allow for potassium leakage. The sodium pumps in neuronal membranes bring more Na+ than K+ ions into the cell; with every three sodium ions pumped out two potassium ions are brought in- this is in order to maintain the negatively charged membranes within the cell along with the resting potential.
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The part of the eye that allows for varying amounts of light onto the retina is the Iris. <- Answer