The reason why the animal that has been struck by the arrow
goes limp and quickly suffocates because the acetylcholine receptor sites are
blocked and this was made possible because of the drug curare they use in
poisoning the top of the arrows.
Answer:
Option C. is correct.
Explanation:
According to Chargaff's rules, DNA (Deoxyribonucleic Acid) from any species of an organism should have purine and pyrimidine bases in the ratio 
This ratio is very important for solving the structure of DNA.
As per this rule, DNA is double-stranded, and covalent bonds between identical nucleotides hold the strands together.
So, Option C. is correct.
Answer: d. exoskeletons are external to the soft tissues, and endoskeletons are internal
Explanation:
The skeleton can be define as the body part of the living beings which act as a supporting structure which maintains the posture and provides the supporting framework to the body. The exoskeleton is the skeletal structure that protects the body from outside. It encloses within it the soft tissues and organs of the body. It is the characteristic feature of the invertebrates. It is the external feature of the body. It also provides protection against the predator. The endoskeleton is the skeletal structure which serves as a attachment point for the muscles. It is the internal feature of the body.
Answer:
Environmental, spatial and topographical factors.
Explanation:
Air temperature depends on many diverse environmental (vegetation) and geographical factors, being the most important one the altitude on the sea level since this factor can directly affect the amount of radiation received on the Earth's surface. Recently, many meteorological models capable of estimating air temperature under certain conditions have been developed. These computational models consider a multiplicity of factors and use input data that are associated with the topography and the location (e.g., longitude, latitude and altitude).
