The Cell Wall is the answer that your ur question
Answer:
i think this will help im not 100% sure though
https://www.isd2135.k12.mn.us/cms/lib/MN01001544/Centricity/Domain/54/Chapter%207.1%20Guided%20Reading%20Key.pdf
Answer:
Negative feedback has the function of controlling and regulating the processes of a system. Without such a mechanism there would be no balance in the body. As such, it is responsible for maintaining balance within the system, counteracting or modifying the consequences of certain actions, that is, it seeks to reduce the effects of external aggressions.
Explanation:
When an internal or external variable of the body changes with respect to normal limits, a response is triggered that reverses the change. In this case, we are in the presence of a negative feedback. In negative feedback there are normally three parties involved: the so-called receptor, the control center, and the so-called effector. The receptor is the organ or tissue that intervenes in the negative feedback process, recording the values of some variable of the organism; these variables can be very different, for example temperature, blood pressure or blood glucose concentration. The information collected by the receiver is continuously sent to the control center. When the received values go out of the normal ranges, the control center will send orders to the effector organs so that they begin to function in a certain way that helps to return the values of the variable to the normal values in basal state.Negative feedback is the main control mechanism of homeostasis and as such is essential to keep the different parameters of the body between the values in which it can perform its functions. If negative feedback didn't exist, we would die. In fact, when negative feedback control mechanisms fail, we have to resort to medicine to help the body maintain homeostasis.
Characters of the fossils of dinosaur indicate that
reptiles are closely related to birds
The general principle states that the present is the key to
the past. Dinosaurs are creatures of the past but from their fossils, it’s
evident that they are actually related to the present day birds. The shape of
the pelvis is one of the most common characters that link birds to dinosaurs. The
feature of the pelvic girdle shows that dinosaur-Deinonychus and the earliest
fossil bird Archaeopteryx are closely related; suggesting that birds are
closely related to dinosaurs.
Further, birds have feathers and reptiles have tough beaded
skin or scales. Although birds don’t resemble any living reptile, scientists
suggest that birds actually evolved from reptiles. One of the characteristic
that makes scientists believe so is that both birds and reptiles lay eggs and share several skeletal characteristics,
such as the way their jaws attaches to the skull. According to the fossils recovered
from the Solnhofen Limestone of Germany, it’s true to say that birds and
reptiles share a lot of characteristics. The fossils have a wishbone,
consisting of the fused clavicle bones so typical of birds and closely resemble
small theropod dinosaurs.
Another fossil in China suggest that theropods had feathers,
providing more evidence for this relationship. We cannot exhaust the
characteristics relating birds to reptiles but we have discussed some rigid and
proved evidence that relate birds to reptiles and dinosaurs.
D) <em><u>a beneficial mutation that increased survival of certain plants that reproduced and passed the mutated gene to offspring.
Hope this helped! xD</u></em>
