Determine whether each of the following is a characteristic of dna, rna, or both.
is single-stranded:
contains nitrogenous bases:
contains uracil:
contains adenine:
is double-stranded:
is made of nucleotides:
contains deoxyribose sugar:
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The energy needs of a human population are not affected by

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat