Recycling light energy to be used in the process of photosynthesis
If it's two different kinds of birds it's called competition.
The one that is 5m long is going to be longer and or shorter depending on where the sun. Both the 2m and 5m are going to be depended on which way the sun is facing. for example if you where standing outside and the sun was right behind you your shadow is going to be longer than a person who is shorter than you but if the sun is facing right above you will be the same height because of the way the sun is facing.
<h2>Antigen-presenting cells</h2>
Antigen-presenting cells (commonly abbreviated to APCs) are a vastly varied group of white blood cells that take part in the immune response by <em><u>processing antigens to present to T cells</u></em>, so the latter can recognize the threat and carry a response.
B lymphocytes are immune cells capable of producing antibodies to attack foreign threats (this is called humoral immune response), for this to be possible, B cells need to be <em>previously activated by T-cells</em>.
But B cells can also act as antigen-presenting cells when the antigen is a molecule simple and repetitive in structure, and capable of evoking an immune response without the participation of T cells (T-cell-independent antigen). This response will consist of antibodies production as well.
<h2>T-cell-independent antigens</h2>
There are two types of T-cell-independent antigens (TI):
- TI-1 antigen: can activate B cells <em>directly</em>.
- TI-2 antigen: its highly repetitive structure generates multiple cross-linking of B cell receptors (BCR), thus triggering its activation.
In conclusion, <u>B cells can act as APCs when the antigen is T-cell-independent</u>.
To learn more about the immunity, read here:
brainly.com/question/11101746
Explanation:
Which statement correctly describes how the parts of a flowering plant contribute to its survival? A. Roots prepare the plant for seed production, while the stem releases pollen for fertilization. B. Sepals prepare the plant for pollination, while the leaves collect oxygen for photosynthesis. C. Petals are involved in the reproductive cycle, while stamens protect the plant from predators. D. Ovaries are involved in fertilization and seed production, while anthers and