Answer:
All atoms can be identified by the number of protons and neutrons they contain. The atomic number (Z) is the number of protons in the nucleus of each atom of an element. In, a neutral atom the number of protons is equal to the number of electrons, so the atomic number also indicates the number of electrons present in the atom. The chemical identity of an atom can be determined solely from its atomic number. For example, the atomic number of nitrogen is 7. This means that each neutral nitrogen atom has 7 protons and 7 electrons. Or, viewed another way, every atom in the universe that contains 7 protons is correctly named “nitrogen.”
Explanation:
Ethnic is what you call a group sharing a distinctive cultural traits
Answer:
1.5 kcal
Explanation:
The ten (10) percent rule involves how only as low as 10% of the available energy is transferred to each organism in trophic levels. In an ecosystem, the order of trophic levels are: producer ➡ primary consumer ➡ secondary consumer ➡ tertiary consumer.
According to this question, 1500 kcal of energy is starting at the producer level. Hence;
- 10% of 1500 kcal = 10/100 × 1500 = 150 kcal will be available to the primary consumer
- 10% of 150 kcal = 10/100 × 150 = 15 kcal will be available to the secondary consumer.
- 10% of 15 kcal = 10/100 × 15 = 1.5kcal will be available to the tertiary consumer.
Answer:
B, The rigid cell wall of green plants is composed of cellulose.
Explanation:
Cellulose is an organic compound, classified as a carbohydrate, that makes up a tough cell wall surrounding plant cells. It is a polysaccharide with beta 1, 4 d-glucose linkages (very strong bonds) making it very difficult to degrade by hydrolysis and enzymatic action. Through that, cellulose serves an important structural component because it provides roots and stems their rigidity, toughness and protection from microbial degradation.
