BIOLOGY MIDDLE SCHOOL

PLEASE HELP ME Which of the following statements is true?

Geographic isolation is the main cause of speciation.
Hybrid organisms always produce sterile offspring.
If a population is spread out over too large area, they may become extinct.
Speciation can only happen when a population has very low genetic diversity.
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A population of oak trees is separated by a large canyon. Which of the following is most likely to occur?
The two populations will show cospeciation.
The genetic variation between the two populations will increase.
Natural selection will cause one population to die, and the other to live.
Both populations will stop evolving.
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Choose ALL the answers that apply.

Extinction:
only happens above the species level
cannot happen to more than one species at a time
can be caused by habitat destruction
happens when a species or population dies out
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Which of the following statements is true?
Gene flow evens out genetic differences between populations.
Genetic drift increases the genetic differences between populations.
Natural selection, mutation, and genetic drift are random events.
The bottleneck effect increases the genetic diversity of a population.
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A species is endangered if it _____.
no longer exists anywhere on earth
is in danger of becoming extinct
is not native the environment
has high genetic diversity
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Genetic drift _____.
is a predictable event
increases genetic differences between populations
happens when random events change the genotype of a population
happens when well-adapted organisms survive and reproduce more often than poorly-adapted organisms

Answers

Answer 1
Answer:

Answer: C, If a population is spread out over too large area, they may become extinct.
Answer 2
Answer:

Answer:

A species is endangered if it  is in danger of becoming extinct

Explanation:

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6. 

Tommy and John are trying to move a large table.  John pushes with a force of 1150N and Tommyhelps him by pushing on the same side of the table with a force of 800N.  Sketch the individual forces exerted on thetable and then calculate and show the net force exerted on the table.

Answers

Answer:

Net force = 1150 + 800 = 1950 N

Explanation:

The diagram above illustrate the force applied to the large table by Tommy and John.  The force are exerted in the same direction . The first arrow represent the force applied by John which was 1150 Newton and the second arrow represent the force exerted by Tommy which was 800 newton.  There was no opposing force indicated like gravity from the question so no need to sketch that.

The forces were applied in the same direction, therefore, the Net force can be computed by adding their individual forces .

Net force = 1150 + 800 = 1950 N
First draw a table of sorts. Draw 2 arrows pointing in the same direction towards the table, labeling one as 1150N and one as 800N. Now, since both forces are exerted in the same direction, we can add the forces. So, 1150N + 800N, which is 1950N. There’s no weight and it doesn’t look like gravity is involved. If gravity is involved, just draw an arrow pointed down at the middle of the table, and a normal force pointed up towards the middle of the table. Hope this helps

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