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SOVA2 [1]
3 years ago
9

????? can someone help pls lol

Biology
2 answers:
Shkiper50 [21]3 years ago
8 0

Answer:

b

Explanation:

Mademuasel [1]3 years ago
3 0
D
Explanation: the blood vessel showed above has valves. Veins are the only ones that have valves.These valves prevent backflow of blood to the leg.
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________ is a process that creates genetic variety in cells. (2 points)
Zigmanuir [339]

Answer:

B

Explanation:

I believe it is meiosis because there are two parts in which it helps to increase genetic variety. In prophase 1, the genes cross over, which increases the variety. Also, the chromosomes are assigned randomly in Metaphase 1.

Hope this helps:)

4 0
3 years ago
Read 2 more answers
The primary immune response involves _________
vagabundo [1.1K]

Answer:

d. an immediate increase in the concentration of antibodies, followed by a slow decline.

Explanation:

The Primary Immune Response is mediated by antibodies, which are gamma globulin proteins formed by plasma cells (B lymphocytes). Plasmocyte is a differentiated B lymphocyte capable of actively secreting antibodies.

Antibodies are produced with the main function of neutralizing and eliminating an antigen that stimulated their production. This elimination process is done in various ways through complement fixation, opsionization, anaphylactic reaction (mast cell degranulation), substance neutralization, agglutination, etc.

To neutralize the antigen, the primary immune response promotes an immediate increase in antibody concentration. This is usually a quick process.  This concentration usually begins to decline in a slow process, but it will vary depending on the antigen.

3 0
3 years ago
Kiera and Grace are sisters. They both have blue eyes. Kiera is extremely short for her age and Grace is exceptionally tall for
irakobra [83]
The sisters are different heights because one or both of the parents has a short allele that wasnt dominated by the tall allele, or vice-versa.
5 0
3 years ago
Why is the presence of an integral protein necessary for a charged particle, such as an ion, to cross a cell membrane?
Art [367]

Answer:

Explanation:

Integral membrane proteins are permanently embedded within the plasma membrane. They have a range of important functions. Such functions include channeling or transporting molecules across the membrane. Other integral proteins act as cell receptors

Integral membrane proteins reside within the bilayer membranes that surround cells and organelles, playing critical roles in movement of molecules across them and the transduction of energy and signal

3 0
2 years ago
Match the different roles of people involved in the buying center with their responsibilities.
aliina [53]

Answer:

Initiators  - identify the requirement for a product within the company

Influencers  - provide specifications about the technology needed by the company

Buyers - handle the process of choosing the vendor and negotiating the price

Explanation:

The buying centre of an organisation consists of 7 different member namely Initiators, Users, Buyers, Influencers, Deciders,  Approvers,  Gate Keepers.

  • Initiators  are the person who are first to suggests or initiates of the idea of buying the particular service or product.
  • Influencer are the whose views or idea influence the decision making process. These influencers could be  qualified engineers, technical personnel, consultants.
  • Buyers are the persons who takes care of the the person who handles the paper work of the actual purchase.These buyers plays a vital role in choosing  vendors. Sometimes they also helps in shaping the product specifications.
4 0
3 years ago
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