Which one of the following statements is accurate?
a. compound light microscopes utili...
Which one of the following statements is accurate?
a. compound light microscopes utilize lenses and beams of electrons to produce images.
b. electron microscopes focus beams of light using magnetic fields.
c. electron microscopes are tools used to study living organisms when they're alive.
d. false colors are added to images to make some structures more noticeable
Answers: 2
Biology, 21.06.2019 18:30
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.
Answers: 2
Biology, 21.06.2019 21:30
What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.
Answers: 1
Biology, 21.06.2019 23:00
Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?
Answers: 3
Biology, 22.06.2019 00:10
Lymphatic vessels remove excess fluid from tissues. often after mammexront( the surgical procedure to remove of all or part of a breast) the lymphatic vessels draining the arm are damaged. explain a consequence of this damage. what can be done to reduce the symptoms?
Answers: 3
Social Studies, 22.07.2019 18:30
Mathematics, 22.07.2019 18:30
English, 22.07.2019 18:30
Mathematics, 22.07.2019 18:30
Chemistry, 22.07.2019 18:30
History, 22.07.2019 18:30
Mathematics, 22.07.2019 18:30