The answer is a. because bacteria are prokaryotes and therefore don't have mitochondria
Each sieve tube element is normally associated with one or more nucleated companion cells, to which they are connected by plasnodesmata (channels between the cells). Each companion cell is derived from the same mother cell as its associated sieve tube member. Sieve tube members have no cell nucleus, ribosomes, or vacues. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules
1. A , 2. D, 3. A , 4.C , 5. B , 6.A
Individual , population , community then ecosystem.
Answer:
The correct answer is - More motor neurons and larger motor units are activated to stimulate a greater number of muscle fibers for a more powerful muscle contraction.
Explanation:
Recruitment in muscle contraction or motor unit recruitment refers to the periodical stimulation or activation of the one or more motor neurons to get the more or enhanced strength in a muscle contraction.
Additional motor neurons or motor units are activated, along with larger motor units to stimulates a higher number of fibers for increased strength of muscle contraction.
