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HACTEHA [7]
2 years ago
11

What step does every scientific experiment begin with?

Biology
1 answer:
crimeas [40]2 years ago
8 0

Answer:

make objective observations.

Explanation:

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How does photosynthesis contribute towards maintaining a clean environment and ensuring food security?​
azamat

Answer:

Well for one photosynthesis gives out oxygen. This makes all animals able to live. So in that way it helps us and the world around us. Without photosynthesis we also could not eat food. No animals could live and no plants ould live. VERY IMPORTANT!

Explanation:

5 0
3 years ago
Consider the evidence that explains how physical separation of two populations of a species can cause speciation. What effect do
Tom [10]

Answer:

  • Interruption in the genetic flow between separated groups
  • The emergence of new mutations in each of the groups, and their accumulation in time. Slow and gradual differentiation between populations.
  • Genetic divergence by natural selection and reproductive isolation
  • Prezigotic isolation mechanisms

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background that can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new groups that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

The process of allopatric speciation involves different steps that affect organisms:

  • The emergence of the barrier.
  • Interruption in the genetic interchange
  • The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
  • Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
  • Prezigotic isolation mechanisms will be favored by selection if occurs a secondary contact between the new species in formation.
4 0
2 years ago
In which of the following structures of a vascular plant would you expect to find totipotent cells? select all correct choices.
natita [175]
The choices can be found elsewhere and as follows:

A. mature leaves
B. shoot apical meristem
C. cell elongation zone
<span>D. axillary buds
</span>
I think the correct answers are option B and D. It would be at the shoot apical meristem and the axillary buds that <span> a vascular plant would you expect to find totipotent cells. Hope this answers the question.</span>
8 0
3 years ago
Where is the cerebrum located
tester [92]
The cerebrum is a large part of the brain containing the cerebral cortex it lies either in front or on top of the brainstem
6 0
3 years ago
Why is tissue typing necessary before a kidney transplant?
MakcuM [25]
C. to determine the compatibility of antibodies of donor and recipient.
6 0
2 years ago
Read 2 more answers
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