Which of the following is the biggest threat to the monarch butterflies’ annual migration? a. illegal logging c. airplanes b. cold winters d. new predators select the best answer from the choices provided a b c d

Option 'A' is correct.

Explanation:

The biggest threat to Monarch butterflies is illegal logging in Mexico.

Illegal logging of butterflies has been increased in the previous years, during that period, monarch butterflies were sold illegally in violation of national law.

Now, the government starts eradicating illegal logging from the root.

Hence, option 'A' is correct.

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.