Answer:
1. a 2. d 3. b
Explanation:
1. Changes in the atmosphere causes changes in the hydrosphere which affects the biosphere.
2. Hydrosphere, geosphere, atmosphere
3. Melting glacier provides fresh water for plants and animals.
Answer:
mackerel is the secondary consumer
Explanation:
because it is
Answer:
R/ Protects sperm antigens from exposure to the cells of the immune system.
Explanation:
In mammals there is a barrier (blood-testis barrier) within the seminiferous tubes formed by tight junctions between Sertoli cells that separates spermatogonias from primary spermatocytes. This barrier separates the seminiferous tube into two compartments, the basal and the adluminal. The basal compartment between the basement membrane and the tight junctions can be accessed by elements of the plasma and immune cells, while the second compartment is not.
Answer:
For most of us, between 60 and 100 beats per minute (bpm) is normal.
Explanation:
The rate can be affected by factors like stress, anxiety, hormones, medication, and how physically active you are.
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