百度试题 结果1 题目36 What is defined as 'all of the populations of different species in an ecosystem'? A A community B. environment C habitat D. trophic level 相关知识点: 试题来源: 解析 A 反馈 收藏
The collection of all the populations of different species in an area forms a ___. A. ecosystem B. biotic community C. population D. food chain 相关知识点: 试题来源: 解析 B。本题考查相关概念。一个区域内不同物种的所有种群的集合形成生物群落。选项 A“ecosystem”还包括非生物成分。选项 C“...
have been reported from this species. In this study, morphological, phytochemical, antioxidant and genetic variations of 11 distant populations of P. verticillatum were measured. Considerably ( P <0.05) higher variations were recorded among different populations of P. verticillatum using morphological...
If natural selection was the explanation, then there should be different survival rates for dark- and light-colored moths. [#insert1] To determine whether this was true, Kettlewell released thousands of light and dark moths (each marked with a paint spot) into rural and industrialized areas. ...
急性T淋巴细胞白血病(T-ALL)是一种早期淋巴样肿瘤,主要是表达未成熟T细胞表面标志物的恶性淋巴母细胞T淋巴母细胞不受控制地增殖并弥漫性浸润骨髓,抑制正常的造血。
To stave off extinction, 40 species of snails, each about the size of a dime, live in human care inside an unremarkable trailer near Honolulu. For some, it's the only place where they're found, their wild populations having completely disappeared. "Most people, when they think endangered ...
Birds,butterflies,bats and bees are all pollinators(传粉者).However,bees are classified as the most important pollinators for the existence of plants and harvest of produce worldwide.They contribute a lot to the produce we harvest,both directly and indirectly. There are about 20,000 bee spec...
THE GENETIICCAALL SSOOCCLIETY OF GREAT BRITAINN AABBSSTTRRAACCTTSS ooff PPaappeerrss pprreesseenntteedd aatt tthhee HHUUNNDDRREEDD AANNDD SSEEVVEENNTTYY--FFIIRRSSTT MEETING of the Socieettyy hheelldd oonn 44tthh,, 55tthhaanndd66tthhAApprrIIll11997733InInththeeBBioiolologgIcicaall ...
For millennia Indigenous communities have relied on the far north's caribou herds for sustenance. But as the herds dwindle, the future becomes difficult to predict.
1. Strengthening theinstitutions through which the people run the country Wemust uphold and improve our country’s foundational, basic, and important politicalsystems, expand democratic channels, and diversify the forms of democracy, soas to ensure that people...