The correct answer is the trophoblast forms two distinct layers.
Under usual conditions, fertilization takes place in one of the fallopian tubes, then the fertilized egg starts to produce its path towards the uterus. By about the fifth day of conception, the embryo ultimately reaches the uterus and gets the implant in the uterine lining or endometrium.
During week II of implantation, the trophoblast layer gets involved by combining with the uterine wall, and during this time the layer of trophoblast differentiates and proliferates into two different layers, that is, cytotrophoblast and syncytiotrophoblast.
The study of how living things are classified is called dichotomous key
Answer:
<em>1. Context clues
</em>
<em>2. Tone
</em>
<em>3. Word choice</em>
Explanation:
Context clues: Context clues can simply be defined as the hints that we get about the meaning of a word by reading a sentence or sentences related to that word. We can simply infer the meaning of the word by reading the sentence.
Tone: The tone of a sentence helps us to identify what the word in the sentence might mean. For example, if a sentence has a happy tone, we might infer that the word is related to some kind of happy meaning.
Word choice: The word choice refers to the selection of words by the writer. The usage of words by the writer helps us determine what the writer might mean by a word.
Answer: The correct answer is Parrot and Dog.
The animals which can maintain their body temperature by generating internal heat are called as warm-blooded animals or endotherms. They maintain constant temperature irrespective of the temperature in their surrounding.
These animals mainly include birds and mammals.
On the contrary, the cold-blooded animals ( ectotherms) are those, which absorb heat from surrounding and do not generate much of the internal heat. Their temperature fluctuates as the surrounding temperature changes. These animals include reptiles, amphibians, fishes, and invertebrates.
Thus, the correct answer is parrot ( bird) and Dog( mammal)
Answer:
Animals need resources to survive.
Explanation:
With a lack of enough resources for various animals, it generates competition for resources and eventually animals will start to starve and die off.