The nephridia in the earthworm form part of the
reproductive system
respiratory system
circulatory system
excretory system
Correct answer is D
In earthworms, members of the phylum Annelida, the excretory system consists of structural units called nephridia (the singular is nephridium).
evolution
adaptation
variation
heredity
Correct answer is D
No explanation has been provided for this answer.
discontinuous variation
continuous variation
a mutant
a genome
Correct answer is B
Variations can be:
We can all either roll our tongue or not; there's nothing in between.
Others are Eye colour, handedness, & lobed/lobeless ears.
The uniqueness of an individual organism in a population is accounted for by
evolution
variation
adaptation
mutation
Correct answer is B
Variation is the difference between individuals within a species.
Variations could occur by inherited or acquired characteristics.
The major cause of global warming is
burning fossil fuel
constructing dams
electricity utilization
space exploration
Correct answer is A
As greenhouse gas emissions blanket the Earth, they trap the sun’s heat. This leads to global warming and climate change.
This global warming is caused by increased concentrations of greenhouse gases in the atmosphere, mainly from human activities such as burning fossil fuels, and farming.