How does summation operate in a post-synaptic cell? A). It adds up all of the previous action potentials and releases one of that value. B). Post-synaptic cells do not fire. C). Input from many cells is required for it to fire. D). Sodium ions are moved from one cell to the next in an additive way.

Answer:

Flowering plants (Ans. C)

Explanation:

Gymnosperms are the non-flowering plants and produce seeds that are not enclosed within an ovary. they contain their seeds on the surface of the leaves and open to the air which is directly fertilized with the help of fertilization.

Gymnosperms include:

1) Cycads (division Cycadophyta): These are woody trunks, evergreen compound leaves. The example includes cycas.

2) Conifers (division Pinophyta): Theses are woody, cone-bearing shrubs and tissues with vascular tissues. Examples include Pines, Redwoods, Cedars. etc.

3) Ginkgo biloba (division Gynkgophyta):These are a cylinder, large and fan-shaped leaves. The example is Ginkgo biloba.

So, the flowering plants are not included in gymnosperms.

Conifers

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The answer is A: Swimming into colder water. When fish are hot, they swim deeper; which is the same thing as swimming into cold water. B is incorrect, because if the fish is hot, there's no use going to the surface-which is hotter- to evaporate water from it's skin. By the way, what's the use of evaporating water again? The fish is still hot! C is wrong, because the only fish known to man that expels water, is the puffer-fish. Since the answer talks about fish in general, C is eliminated too. Finally, D is wrong because... um... someone please explain to me why a fish will speed up when the fishes temperature is getting hotter then supposed to!

Hope I helped!

Answer:

a

Explanation:

Answer: True

Secondhand smoke is produced from the burning of the tobacco products such as cigars, cigarettes, bidis and pipes. This is smoke which is breathed out or exhaled by the smoking person. The smoke includes toxic gases. Smoking in the enclosed spaces such as homes, workplaces can be hazardous for the smoker as well as for the people present surrounding him or her. An appreciable amount of secondhand smoke in an enclosed space can cause ear infections, asthma attacks, respiratory attacks such as coughing, sneezing and labor breathing, respiratory infections such as pneumonia and bronchitis and a greater risk of sudden infant death is also associated with it.

On the basis of above description, the secondhand smoke is more dangerous in enclosed spaces is true.

True. Secondhand smoke, also known as passive or involuntary smoking, is more dangerous in enclosed spaces.

When someone smokes, the smoke released contains numerous harmful chemicals, including carcinogens, toxic particles, and gases. When this smoke is released into the air, it can linger and accumulate in enclosed spaces, leading to increased exposure for non-smokers in the vicinity.

In enclosed spaces like homes, cars, bars, restaurants, or other indoor areas with poor ventilation, the concentration of secondhand smoke can become significantly higher than in open, outdoor areas. Prolonged exposure to secondhand smoke in such environments poses serious health risks, particularly for vulnerable individuals such as infants, children, pregnant women, elderly people, and those with pre-existing respiratory or cardiovascular conditions.

Research has shown that secondhand smoke exposure can cause a wide range of health problems, including respiratory issues (such as asthma exacerbation and respiratory infections), heart disease, stroke, lung cancer, and even sudden infant death syndrome (SIDS) in infants.

To protect public health, many countries and regions have implemented smoking bans in enclosed public spaces and workplaces to reduce secondhand smoke exposure and its associated health risks. Encouraging smokers to smoke outdoors or in well-ventilated areas can help minimize the impact of secondhand smoke on non-smokers' health.

To learn more about Secondhand smoke, here

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Answer;

C. The six-kingdom system has three domains: two domains separate all prokaryotic organisms into two new groups.

Explanation;

• The six-kingdom system has three domains: two domains separate all prokaryotic organisms into two new groups.
• Organisms are classified into three Domains and into one of six Kingdoms of life. The three-domain system has Archaea, Bacteria, and Eukarya, while the Kingdoms are Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia.
• All eukaryotic organisms are in the domain Eukarya. Prokaryotes are divided into two kingdoms and two domains, Archaea and Bacteria.