During which part of pregnancy does the fetus begin to blink its eyes and become more active

1 answer:

6 0

The answer is In the last trimester of pregnancy. While the senses of the fetus start to develop in the 8th week, the different sense mature at different stages. Vision is the last sense to mature. After the 26th week, after the eyelids of the fetus have fully developed, the fetus begins to blink (even experience REM while involves rapid eyelid movements ).

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Mass extinctions have occurred five times in Earth's history. The Permian and Cretaceous extinctions removed a large percentage

d1i1m1o1n [39]

Answer:

A. Species that remained after the extinction were able to radiate, new adaptations arose, and these adaptations produced the diversity seen today.

Explanation:

When species went extinct they also left niches that could be occupied by "new" species; new places to live, places to be filled in the food web and different relationships to be formed. The wide availability of resources made organisms to radiate leading to a "new" diversity of shapes, sizes, and lifestyles.

B. Species that have gone extinct were able to re-evolve from the ancestors that survived the extinction. If you are extinct you are gone forever.

C. Species that remained after the extinction were unable to speciate. Therefore, the number of species on Earth today is lower than the number of species present just before either extinction. The fossil record proves that species have changed over time and the diversity has changed over the history of Earth.

D. Species that remained after the extinction represented all of the lineages that were present before the extinction event. Therefore, extinction did not change the diversity of lineages. Again, the fossil record is evidence that lineages have changed over the history of the Earth.

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A paragraph on the 3 forms of energy involved in a muscle contraction

irga5000 [103]

There are three types of energy involved in a muscle's contraction. There is metabolism, catabolism, and anabolism. Metabolism is the events that are carried out in the human body to create energy and other things needed for activity. Catabolism is the process during the organic matter is broken down and the energy is released, it takes place during increased movement. Anabolism is the energy-consuming process that substances are created, it takes place when there is little movement. All three of these work to gather in muscle contraction.

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3 years ago

Why is an atom said to be electrically neutral? Please i need further explanation

soldier1979 [14.2K]

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge.

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3 years ago

Please answer all questions <br><br>and the questions is on the picture

Elena L [17]

Answer:

1)grass is producer

2) primary consumer are mouse,rabbit,and grasshopper

3) secondary consumer is snake

4) tertiary consumer is cookaburra

5)top predator is eagle