Answer:
The atomic number is 79 and the atomic mass is 197.
Explanation:
The atomic number (symbol Z) of a chemical element is the number of protons within its nucleus.
Gold (chemical symbol Au) is a chemical element with 79 protons in its nucleus, therefore with atomic number 79.
The atomic mass is the average mass of the atoms of an element (in atomic mass unit). The atomic mass is the weighted average of all the isotopes of a a particular element. For each isotope the atomic mass is approximately the mass of both protons and neutrons since electrons make minor contributions.
The atomic mass of Gold (Au) is 196.9665 but, it can be rounded to 197.
Answer:
Explanation:
ells need both chloroplasts and mitochondria to undergo both photosynthesis AND cell respiration. After photosynthesis, which chloroplasts are needed for, which yields oxygen and glucose, plants need to break down the glucose and they use cell respiration to do this, which happens in the mitochondria.
Answer:
D
Explanation:
D is the only option where the cause of the pollution is not something man-made.
The cell would die and colapse under its own weight.
Answer:
are not dependent on water for reproduction
Explanation:
In terms of seed production, plants are generally divided into 2:
- Seedless plants
- Seed producing plants
Seeds serve as structure for propagation and contains an embryo that is usually nourished and protected by the seed coat. The embryo results from fertilization of the ovule by the pollen grain, a process that takes place after pollination. The entire process is independent of water.
Seedless plants produce spores instead. These spores can be sexual or asexual. Sexual reproduction in seedless plants requires that the male gametes (sperms) swim to meet the female gametes (egg). Consequently, water is necessary for the motile male gametes and that is why most seedless plants grow is aquatic or moist areas.
<em>Hence, unlike seedless plants, seed plants are not dependent on water for reproduction.</em>