Answer:
1. producers would be things like plants if those were removed we would have no oxygen and herbivores would have no food
2. an area of all of the living things
3. Food chains overlap. They connect to form a food web
4. can threaten the plants and animals that originally made up the ecosystem
5. Human activities that can disturb ecosystems include polluting and clearing land for farms or buildings
6. producer, consumer and decomposer
7. Decomposers break down the waste products and dead tissue of plants and animals. They return nutrients to the soil.
Explanation:
Mechanical waves need mediums. or else it isn't a mechanical wave
Answer:
It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).
Explanation:
The characteristics of mixtures are:
a) they are made up of two of more substances
b) the two substances can be separated by physical means
c) there are two kinds of mixtures : homogenous and heterogenous
d) homogenous mixtures do not have any physicaly distinguished boundary
Answer:
The exceptions to the periodic trends in ionization energy are the first ionization energy of beryllium is higher than that of boron and the first ionization energy of nitrogen is also higher than that of oxygen.
Explanation:
Taking a close look at the figure of first ionization energies, it clearly shows that the first ionization energy of beryllium is higher than that of boron and the first ionization energy of nitrogen is also higher than that of oxygen.
This is as a result of Hund's rule and electron configuration. For example, the first ionization potential electron of beryllium is obtained from a 2s orbital while that of boron comes from a 2p electron. However, for oxygen and nitrogen, their electrons are obtained from 2p orbitals. While spin is uniform for all 2p electrons of nitrogen, it is different for oxygen.
