Biology, 27.05.2020 02:06 lizettediego10
Which of the following is most likely a characteristic of a person with a weakened immune system?
A. T cells are very active in fighting infections.
B. The body replaces T cells as quickly as those cells die.
C. Opportunistic infections make the person very sick.
D. White blood cells produce many antibodies.
Answers: 3
Biology, 21.06.2019 16:40
Some plants rely on the wind to reproduce an example is itβs important for plants to use the forces of nature to reproduce because 1. 1a white tuft of dandelion seeds 2a spiked burrs surrounding seeds 3a hard shell on a walnut? 2. 1b require pollination to reproduce 2b reproduce only asexually 3b cannot move about freely?
Answers: 3
Biology, 21.06.2019 17:30
Which organelle releases chemicals that break down large food particles into smaller ones?
Answers: 1
Biology, 21.06.2019 20:00
Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution
Answers: 2
Biology, 22.06.2019 00:50
Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back
Answers: 2
Which of the following is most likely a characteristic of a person with a weakened immune system?
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