Trợ giúp bài tập về nhà môn Sinh học

Soil thawing in Alaskachas been accelerating in response to climate warming , potentially,enabling increased carbon dioxide (CO2) absorption through greater productivity of bog bilberry (Vaccinium uliginosum) plants and other vegetation , but also cpotentially enabling increased CO2 output through greater heterotrophic respiration CO2 generated by the activity of soil microorganisms). Hydrologist YonghongYi and her colleagues developed a model incorporating numerous inputs?-years of soil temperature and snow cover data among them-to evaluate the effects of warming on the CO2 balance in Alaska, concluding that net CO2 is likely to increase if warming hastens spring snow melt. Which finding, if true , would most directly support the researcher's conclusions? A) Early snow meltaslows the growth of plant species such as V. uliginosum by reducing ground inculation, and it suppresses heterotrophic respiration. B) Early snow melt extends the period in which plant species such as V uliginosum can absorb CO2 but has no effect on the rate of heterotrophic respiration C) Early snow melt croduces the amount of soil moisture available for the growth of plant species such as V. aliginosun , and it raises,the rate of heterotrophic respiration. D) Early snow melt amplifies the effect of soil such V. uliginosum and on the rate of heterotrophia respiration.

Kể tên các giống cây trồng phổ biến ở địa phương em? Thế nào là giống bản địa, giống nhập nội, giống lai?

Cells, including those of yeast , plants, animals and humans, all contain gene regulatory circuits that are responsible for many physiological functions ,including aging.However , a team of researchers at the University of California , SamDiego , discovered that cells do not necessarily age the same way. The researchers envisioned a "smart aging process" that would extend cellular longevity by cycling deteriorat ion from one aging mechanism to another. They genetically rewired the circuit that controls cell aging and engineered a clock -like apparatus called a gene oscillator The device causes a cell to periodically switch between two determined "aged" states, avoiding prolonged commitment to either and thereby __ Which choice most logically completes the text? A) accumulating errors in its DN A. B) deterioratin at a slower rate. C) communicating more rapidly with other cells. D) replicating at an accelerated pace.

The human body relies heavily on electrical charges. Lightning-like pulses of energy fly through the brain and nerves and most biological processes depend on electrical ions traveling across the membranes of each cell in our body .These electrical signals are possible,in part, because of an imbalance in electrical charges that * cexists on either side of a cellular membrane. Until recently , researchers believed the membrane was an essential component to creating this imbalance.But that thought was turned on its head when researchers at Stanfoxd University discovered that similar imbalanced electrical charges can exist between microdroplets of water and air. According the text , what is true about electrical ions? A) They can travel across membranes at an extremely high speed. B) Their charges become imbalanced outside of a living cell. C) They require a membrane to develop different charges. D) They are unable to send signals without a membrane present.

Sau khi học tiết I cua bài cho HS C bị ở nhà dưới dạng dự án và thuyết trên lớp. 1. Hút thuốc lá có hai như thế nà với hệ hô hấp? 2. Loi ich của thể dục, thể thao đ, hệ hô hấp