Answer:
<u>True!</u>
Explanation:
The longest geologic era was the Precambrian. It began with the formation of the earth about 4.53 billion years ago, and ended about 542 million years ago.
This means this period lasted approximately 3.98 billion years!
As such it's undoubtedly the longest geologic era by a long shot!
Answer:
they are good source of fibre
Answer:
r-selected
Explanation:
R-selected species are organisms The carrying capacity is not a limiting factor. The life span of these individuals is short and in general there is no care with the offspring. They aim to exploit empty niches and produce a large number of offspring each cycle, even though few of them survive to adulthood. Informally it can be said that this is a strategy based on quantity rather than quality. Examples of r-selected species: insects and most fish.
Answer: B) Tuna that feed on smaller fish that feed on krill that feed on algae
Explanation:
Methyl Mercury is a persistent substance which is not easily biodegradable, when released to the water body it is ingested, and can build up in living organisms, or bioaccumulate.
This build up in living organisms, inflicts a spiraling levels of harm as the food chain ascends, for example on higher order species such as predatory fish and fish eating birds and mammals — through a process know as "biomagnification".
The most affected is the species highest in the order. The tuna fish eats smaller fishes and is therefore most affected through biomagnification of mercury bioaccumulated food it ate.
Thus the Tuna fish have the highest levels of methylmercury, and therefore feels the severest effect.