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olga_2 [115]
3 years ago
7

Please someone help me with this

Biology
1 answer:
fiasKO [112]3 years ago
8 0

Answer:

Explanation:

1. a. Sunlight hitting the Earth's surface is the source of all energy in the pyramid.

b. 25,500 kcal is provided by this source to a square meter per year.

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Which energy are formed by light depended reations
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In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom. 

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Assuming that a mountainside, which slopes and has a plain, which is flat, received the same amount of rain, which is more erode
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Read 2 more answers
The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called ______. A. hol
andriy [413]

The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called meroblastic development, which is typical of birds.

Therefore, the correct answer is Option D.

<h3>What is embryonic cleavage?</h3>
  • Embryonic cleavage is the division of cells which occurs just after fertilization and are involved in the early development of the embryo.
  • The different cells formed after cleavage are called the blastomeres and these are present in a compact mass called the morula.
  • The end product of cleavage is blastula which is a hollow sphere with a cavity called blastocoel.
  • Cleavage can be of different types depending upon the concentration of yolk in the egg as yolk does not undergo cell division.
  • In holoblastic cleavage, the entire egg divides as yolk is present in very less concentration.
  • In meroblastic cleavage, only the cells lacking yolk divide.

Learn more about cleavage here:

brainly.com/question/9962891

#SPJ4

7 0
2 years ago
A city was intensively sprayed with DDT to control houseflies. The number of houseflies was immediately greatly reduced. Each ye
Anestetic [448]

Answer:

Option D, The DDT killed susceptible flies. The few that were already naturally resistant survived and passed this resistance on to their offspring.

Explanation:

When DDT was sprayed for the first time, some of the house flies which were not capable enough to withstand the adverse effects of DDT , eventually died. And the butterflies that survived through this,   were having a natural resistance against DDT. Now, with time these DDT resistant houseflies mated and produced offspring that had genetic trait of resisting DDT by birth. This is the reason,  why houseflies after ten years were as abundant as  ten years back when the control program was started.

Option D is correct

3 0
3 years ago
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