Ans.
Memory cells of immune system are present in G0 phase, in which these cells are not activated or responding for a pathogen.
The cell-cycle is defined as the series of events that lead to DNA duplication and division of a cell to form daughter cells. The cell cycle is divided into interphase and M phase.
The interphase includes gap 1 (G 1) phase, S or synthesis phase, and gap 2 (G 2) phase, while M phase includes karyokinesis and cytokinesis.
The cells after M phase either goes for next cell division or G1 phase or for G 0 (gap 0) phase. The G0 phase is resting phase, in which cells show a quiescent state.
As memory cells are present in resting phase, till the next exposure of same antigen, these cells are in G0 phase of cell cycle.
Answer:
The correct answer is -
A) Fungal contraction to the oak tree
B) Less precipitation.
Explanation:
A biotic factor is the living thing present in an ecosystem and affects the system and leads to changes in the system. Here fungus is a living organism that influences the population size of the oak tree and the squirrels negatively.
An abiotic factor is a non-living thing condition or factor that affects the system and leads to the changes. In this case, the high temperature and the low rate of precipitation lead to changes in the size of the population.
You can use a model to show things that are either vary big like the solersystem or vary small like a strand of DNA
The correct option is this: A STRONG WIND BLOW ACROSS A MIDWESTERN PRAIRIE.
A strong wind is an example of a natural force. The prairie refers to a land fill with grasses and that is a natural factor also. Thus, a strong wind that is blowing across a prairie is generating a natural form of energy. The energy flow in the other options given are examples of man made devices.
