Energy is an ecosystem flows only one way.
Energy flows through an ecosystem in only one direction as it is passed from organisms at one trophic level or energy level to organisms in the next trophic level.
Producers or plants use the Sun's energy to make their own food.
A dna double helix consists of a purine base, such as adenine and guanine, paired with its complementary pyrimadine base, such as thymine and cytosine.
Adenine pairs with thymine; A-T
Cytosine pairs with guanine; C-G
Answer: Option D
Explanation:
Asthma is an obstructive pulmonary disorder in which there the bronchial tubes are extra sensitive. The passage of airways becomes inflammed and produces excess of mucous.
Asthma is generally triggered by dust particles or allergens which is found in the air. It is a very common problem and if affects many people around the world.
The people suffering from asthma must avoid dusty and smoky places to avoid or reduce asthmatic attacks.
Cleavage as part of embryonic development is idiosyncratic since it involves the cell division which includes the process of mitosis with minimal or no growth in successive divisions. Hope this is right and the correct answer you are looking for.