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MA_775_DIABLO [31]
3 years ago
11

A student creates a model of a closed ecosystem by filling a glass tank half full with water then addin 10 snails and two small

aquatic plants .the next day all the snails are dead. Which is the most likely cause if their death
Biology
1 answer:
vredina [299]3 years ago
4 0
1. Snails carry out respiration only 2. Aquatic plants carry out both respiration and photosynthesis Although the aquatic plants can absorb carbon dioxide and release oxygen through photosynthesis, the amount of snail is much more than that of the aquatic plants. During night time,the absence of light prevent the plants from carrying out photosynthesis. No oxygen is released at this time. There is a net release of carbon dioxide in the closed system and hence the snail died of suffocation.
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write a paragraph explaining why it is difficult to make drugs or vaccines against HIVgiven the fact that each time reverse tran
Sunny_sXe [5.5K]

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people who are HIV positive but keep the virus in check. This research stems from the International HIV Controllers Study, and researchers hope that their findings will ultimately help inform the development of new therapies and vaccines. Over the last 30 years, scientists have discovered lots of tantalizing clues about the virus, our immune system, and the interplay between the two, but a vaccine remains elusive.

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Vaccines have worked well against once widespread diseases like smallpox and polio. After the AIDS virus was found, many people, including many scientists, thought AIDS would be added to the list. Vaccines mimic natural infections, during which the body produces antibodies that kill the virus. But unlike smallpox or polio, HIV doesn’t stimulate this kind of response – our immune systems are generally blind to the virus and unable to launch an effective antibody attack. Other challenges that scientists face as they try to create a vaccine include a lack of good animal models to study and the virus's ability to constantly change and mutate. Additionally, although controllers can keep levels of the virus low, no one has ever fully recovered from HIV infection. This means there's no natural, winning strategy for scientists to study and try to elicit.

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Explanation:

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