Answer:
Species have changed over time.
Explanation:
The difference is found in the DNA chromosome of the male and females.
The males have XY chromosomes at the last while the females have XX, these chromosome labels are important to signify deviancy and disparities among the morphology and the later structure of the female and male functions.
Earth formed 4.6 billion years ago, and it wasn't until approximately 3.5 billion years ago that we estimate the first prokaryotic unicellular organism existed. The first eukaryote organism probably evolved 2 billion years ago, with the first multicellular organisms evolving about 1 billion years ago.
If 1 centimeter (cm) represents 10 million years (mya), then the 4.6 billion years of the existence of Earth would represent 4.6 meters (m), with the 4.6 m mark being the present.
This means that if we made a timeline with these dimensions, the origin of life would be at the 1.1 meters (110 cm) mark, the eukaryotic life forms appearing at the 2.6 m mark, and the first multicellular organisms around the 3.6 m mark.
Answer:
1. a 2. d 3. b
Explanation:
1. Changes in the atmosphere causes changes in the hydrosphere which affects the biosphere.
2. Hydrosphere, geosphere, atmosphere
3. Melting glacier provides fresh water for plants and animals.
A) nerve roots in the spine are the key componet of intervertebrak disks
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