Answer: a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
Explanation:
A tetanic contraction occurs due to repeated stimuli at short intervals. In this situation, the muscle fiber does nor relax and contracts again. It is a process of sustained contraction of muscles, which evoke when the motor nerve innervates a skeletal muscle and emits the action potential at high rate. The muscles become hyperactive in this condition.
Missing options:
A) Nerodia spedon and Nerodia fasciata
B) Eudocimus albus and Ardea albus
C) Egretta thula and Platalea ajaja
D) Pituphis melanoleucus and Thamnophis proximus
Answer:
A) Nerodia spedon and Nerodia fasciata
Explanation:
Phylogenetically, the closer relatives share same ancestor and therefore same clad in phylogenetic tree. In the given options, Nerodia spedon and Nerodia fasciata share same genus name so they are closer relatives. If we go further about their characteristics, they are two types of water snakes that are found in north and south America. They both are also non-venomous.
On the other hand, remaining options are not correct because none of the mentioned organisms share same genus name and belong to different positions in the phylogenetic tree.
Answer:
D. Tree and car
Explanation:
If biotic means living, and abiotic means non living, then a tree is living while a car is non living. It's also in the correct order.
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Conduction transfers heat through solids , Convection transfers heat through liquids or gasses, and Radiation occurs through a solid, liquid, or gas.
Answer:C
Explanation: El Niño can affect weather around the world
