When did the first modern oceanographic expedition occur?


Answer 1

Modern oceanography began as a field of science only a little less than 130 years ago, in the late 19th century, after Americans, British and Europeans launched a few expeditions to explore ocean currents, ocean life, and the seafloor off their coastlines.

Answer 2

California is the state of the Paul brothers

Related Questions


Which of the following abiotic factors affects the ocean by providing substances that an organism obtains from its environment in order to grow and live? Nutrients Oxygen Salinity Waves


The correct answer is: oxygen and nutrients.

Ocean abiotic factors are non-living factors that influence an ocean ecosystem.

Nutrients are substances that ocean organism obtains from their environment in order to grow and live such as  nitrogen, phosphorus, sulfur, carbon, iron, potassium, magnesium.  

Oxygen is a necessary element required for respiration (most ocean organisms are aerobic), metabolism and other chemical reactions within the organism.  Oxygen in the ocean is produced by algae and phytoplankton via photosynthesis.

The correct answer is option A, B and D i.e Nutrients, Oxygen and waves

Oxygen is required for the respiration of the organism living in ocean. Not only respiration but in order to maintain body metabolism of aquatic animals, carry out the process of photosynthesis in aquatic plants and various other processes in the body, oxygen is extremely vital.

Nourishment are physical or chemical abiotic substances that are essential for the survival of life. The water at shallow depths in the ocean are highly nutritious.  

Waves are important for the energy undulations in the ocean water and are important for the organisms which are living along the coastline


the development of which type of microscope made it possible to create high-resolution three-dimensional images of living cells


Cryo-electron microscopy (cryo-EM), or electron cryomicroscopy, is a form of transmission electron microscopy (TEM) where the sample is studied at cryogenic temperatures (generally liquid-nitrogen temperatures). Cryo-EM is gaining popularity in structural biology.

I hope my answer has come to your help. God bless and have a nice day ahead!

The development of which type of microscope made it possible to create high-resolution, three-dimensional images of living cells?

confocal microscope


What second messenger most directly causes calcium ions to be released from intracellular stores? a. Diacylglycerol
b. Adenylyl cyclase inositol trisphosphate
c. Phospholipase A
d. Phospholipase C


Answer: adenylyl cyclase inositol triphosphate mainly known as IP3 causes the release of Calcium ions directly from the inracellular stores and causea contraction.


IP3, inositol phosphate is a second messenger a signaling molecule. It is made by hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2), a phospholipid that is located in the plasma membrane, by an enzyme phospholipase C.

IP3 binds to the calcium channels and opens Ca2+ channels that are embedded in the ER membrane, releasing Ca2+ into the cytosol. Calcium ions released may cause contraction and regulate the Ca2+ channels in the membranes.


What is not a function of cerebrospinal fluid?


Question is incomplete as the options are not given.Question :

Which of the following is not a function of cerebrospinal fluid?

A) acts as a transport medium for waste products

B) provides cushioning for delicate neural tissues

C) provides buoyant support for the brain

D) produces ATP for impulse transmission

E) acts as a transport medium for nutrients


D) produces ATP for impulse transmission


CSF doesn't produce ATP for the impulse transmission hence option D is the right option.

Cerebrospinal fluid (CSF) performs following functions :

1) Protects the brain and spinal cord from trauma

2) It supplies nutrients to the nervous tissues

3) It removes the waste products from cerebral metabolism.


Accounting for about 1 percent of total blood volume, __________ form a protective, movable army to defend the body against bacteria, viruses, parasites, and tumor cells.



Hope that helped, Good luck! (:

Give two ways that an animal cell differs from a plant cell



Cell wall; chloroplast


Plant cell;

  • Plant cell have chloroplats.
  • Plant cell have cell wall.
  • Plant cell have large singular vacuole

Animal cell;

  • Dont have chloroplastt.
  • Dont have cell wall
  • Have many samller vacuoles.

A woman was chopping vegetables when she accidentally cut her finger. A few days later, she observed a brownish layer on the wound on her finger. Explain how the wound healed itself over time. Tiles Blood vessels dilate. Fibroblasts make collagen. There is an aggregation of platelets. Neutrophils consume the bacteria. The wound closes. Macrophages remove damaged tissue. Sequence ↓ ↓ ↓


First of all, there would be vasodilation of blood vessels. Next, platelets will rush to the wound site forming a platelet plug. Next would be acute inflammation wherein neutrophils consume the contaminants such as bacteria. Macrophages then will remove the damage tissue. Next, there would be production of collagen by the fibroblast which will eventually close the wound.

First, the blood vessels dilate (so the blood cells can go to the damaged tissue)

Then, there's platelet's aggregation (the primary hemostasis) to stop the bleeding

Fibroblasts make collagen to cicatrize the wound

Neutrophils consume the bacteria.

After that, the macrophage removes the damages tissues

And finally, the would closes

that is the right order on plato web

kym t


What is the definition of chromatid?



"They are one strand similar copies of replicated chromosome."


The chromatid is the one part of the two similar copies of the replicated chromosomes. During the process of the cell division those two similar copies join together at the region of the chromosome which is known as centromere. The two attached chromatids are known as the sister chromatids. The basic function of the chromatid is it takes very less time to find its existence in the process of mitosis and meiosis and also helps in maintaining the DNA count where required.  The best example is the sister chromatid i.e. two similar copies of the replicated chromosome.


Tests reveal that a client has phosphatic renal calculi. the nurse teaches the client that the diet may include which food item?


 The nurse should teach patient with phosphatic renal calculi to include apples or fresh fruit on his diet for these fruits are low in phosphate or phosphorus. Moreover, patient should lessen sodium-rich food, which include canned, packaged or processed foods and eating in fast-food chain. Also, consuming too much animal protein, calcium and oxalate increases the risk of developing phosphatic renal calculi.


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