I found the missing part of this question.
Statisics on Human Population
<span><span>Year A.D. Number of People (in billions)
</span><span>1650 .50
</span><span>1750 .70
</span><span>1850 1.0
</span><span>1925 2.0
</span><span>1956 2.5
</span><span>1966 3.3
</span><span>1970 3.6
</span><span>1974 3.9
</span><span>1976 4.0
</span><span>1980 4.4
</span><span>1991 5.5
</span><span>2000 6.0
</span><span>2004 <span>6.4
</span></span></span>
The answer is it took 200 years more to double the population from 0.50 billion to 1.0 billion people. The year was 1850.
It was in 1925 when the population double again from 1.0 billion to 2.0 billion.
The correct answer is :
Some substances but not other can cross the (blank ) membrane of a cell. The blank is to be filled with either cell or plasma. Cell membrane or plasma membrane is the living boundary of a cell which is made of phospholipid. It is a semi-permeable or differentially permeable membrane. It only allows small and non-polar molecules to pass through it. It prevents polar ions or molecules to pass through it
Explanation:
Reforestation of agricultural land can improve biodiversity, which can result in increased primary production, reduced susceptibility to invasion by exotic species and increased ecological resistance to pressures such as climate change
Involves actual transfer of electrons
Answer:
Exercise causes the heart to pump blood into the circulation more efficiently as a result of more forceful and efficient myocardial contractions, increased perfusion of tissues and organs with blood, and increased oxygen delivery.
Explanation:
