Read the following passage to answer the question. The sentences are numbered to help you answer the questions.
(1) The solar system is made up of the sun and the planets that go around it. (2) The planet closest to
the sun is called Mercury (3) The planet next closest to the sun is Venus. (4) Earth is the third planet
and Mars is the fourth. (5) Life on Earth is thought to have begun about three billion years ago. (6) For
many millions of years, the most common life form was bacteria. (7) Scientists have tried hard to
understand how plants and animals developed from these simple, one-celled creatures.
1. The topic sentence in the first paragraph is number
O A.1
OB.5.
O C.4
O D.2

the answer is 1. photosynthesis. glad to

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.