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alexgriva [62]
3 years ago
7

Select all of the answers that apply. Which of the following are possible causes of mass extinctions that scientists have identi

fied? climate changes asteroids hitting Earth widespread volcanic activity the evolution of dinosaurs
Biology
2 answers:
natka813 [3]3 years ago
8 0
Extinction happens when there is a major climate change, then some species are unable to adapt to those changes, so they become extinct. Extinction basically occurs when species are unable to adapt quickly enough to the environment
horrorfan [7]3 years ago
7 0

Answer: asteroids hitting Earth

widespread volcanic activity

Explanation:

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What Are Valence Electrons?Why Are Valence Electrons Important?
Kryger [21]
Valence electrons are the electron on the outer energy level and they are important because they tell if that element is compatable

7 0
3 years ago
When corn plants are too tall, they lodge (topple over) prior to harvest. This is bad since the grain is often lost when it cann
Shalnov [3]

Answer:

The phenotypic variance= 2113

The eenvironmenal variance= 644

The genetic variance= 1469

The broad-sense heritability = 0.695

Explanation:

To determine the phenotypic variance, we need to know the calculate the environmental variance and the genetic variance first;

because Phenotypic variance = V(p) such that;

V(p) = V(e) + V(g)                  

where V(e)  =  environmental variance and V(g)   =  genetic variance

Therefore, Environmental variance can be defined as a portion of phenotypic variance due to differences in the environments to which the individuals in a population have been exposed. The total amount of variance observed is dependent on the genetic component, determined by the variation that is inherited.

This implies that V(e)= initial variance which was there in the parents ( i.e  Variance of inbred line 1 = 311  and Variance of inbred line 2 = 333 )

V(e) = (311 + 333) = 644

Genetic Variance simply refer to the variance that occurs or preferrably , that is observed after inbreeding (i.e Variance of F1 = 316  and Variance of F2 = 1153)

V(g)  = (316 + 1153) = 1469

Now, back to phenotypic variance = V(e) + V(g)

substituting the parameters we have;  1469 + 644 = 2113

Broad-sense heritability can be calculated as the ratio of total genetic variance to total phenotypic variance.

= V(g)/ V(p)

= 1469/ 2113

= 0.695

4 0
3 years ago
help before you could get 100 points but people here only want points and won't help so ill give 30 points
Delvig [45]
It’s blank what’s the question?
5 0
2 years ago
Read 2 more answers
- All bacteria contain peptidoglycan except...
sergeinik [125]
Your answer is D, Rhizobium
3 0
3 years ago
All aerobic exercises are calorie burners and all calorie burners are weight reducers. Thus, all aerobic exercises are weight re
Misha Larkins [42]

Answer:

It is true

Explanation:

The aerobic exercises produce an acceleration in metabolic process. To obtain the necessary energy to do them, the body start to use the carbohydrates. After transforming these carbohydrates into energy, if the body is still in movement, to continue producing energy, the body will continue with the lipids present in the body. In this way, doing aerobic exercises, the carbohydrates and lipids that was used, reduces the volume (and mass) of tissues, in general, from all the body.

 

4 0
3 years ago
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