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Ad libitum [116K]
3 years ago
9

Which time period saw the loss of 96% of all marine species and 70% of all terrestrial species?

Biology
2 answers:
soldi70 [24.7K]3 years ago
6 0

Answer:

Permian-Triassic mass extinction

Explanation:

  • The Permian-Triassic  extinction event, occurred at about 252 MYA. This period marks the boundary between the Permian and Triassic  periods.
  • It is the most severe extinction event that took place on earth, with up to 96% of all marine species and 70% of terrestrial vertebrate species becoming extinct.
  • Due to such a great biodiversity loss, the recovery of life on Earth took a longer time than other extinction events.
kolbaska11 [484]3 years ago
4 0
Answer:  the <span>Permian–Triassic extinction event ; {"end of the Permian era"} .
_____________________________________________________</span>
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2.Which of the following represents a genetic cross between 2 individuals that are each heterozygous for both traits?
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Answer:

A. AaBb x AaBb

Explanation:

The term heterozygous refers to the presence of two different alleles of same gene in an organism. The one allele can be of wild type (original type) and one can be mutated or newly formed.

In the question, two traits are represented by two letters, A and B and alleles as A and a and B and b, respectively. We are asked about a cross involving two traits and two individuals in such a way that both are heterozygous.

If we look at option A, AaBb x AaBb,

we see that one trait A and the other trait B is in heterozygous form (Aa and Bb) in both individuals.

If we look at option B. AABB x AABB

we see that one trait A and the other trait B is in homozygous form form (AA and BB) in both individuals. Homozygous means when the alleles are same for each trait in an individual.

If we look at option C,Aa x Bb

There are not two traits, one trait of one individual and other trait of other individual is being crossed that is not possible.

If we look at option D. AAaa x BBbb

Again, the individuals are homozygous for two traits.


Therefore, A is best option.


Hope it helps!

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