That instant ... typically some moment on june 21 or 22 ... marks
the beginning of the northern hemisphere Summer.
B. Wind.
A abiotic factor is non-living, making a, c and d wrong.
Answer:
Explanation:
AP Biology Question:
Scientists are testing substance L to determine how it enters mammalian cells in a culture. The cells maintain a 120 millimolar (mM) intracellular concentration of substance L . The scientists determined the rate of entry of substance L into the cells at various external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).
Answer:
The sides of the ladder are made of alternating sugar and phosphate molecules. The sugar is deoxyribose. The rungs of the ladder are pairs of 4 types of nitrogen bases. Two of the bases are purines- adenine and guanine.
Explanation:
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