According to the #PadmaPurana; there are 8,400,000 life-form species, 900,000 of which are aquatic ones; 2,000,000 are trees and plants; 1,100,000 are small living species, insects and reptiles; 1,000,000 are birds; 3,000,000 are beasts and 400,000 are human species

and as per modern Science research till now they are able to find out only Over seven million species of plants and animals living on planet earth, according to the best estimates made by biologists, means Science is still behind in understanding the biological and multiverse

structure of almighty.But does that means every time we take birth in same earth in same human species  or in some other species in same universe ?, absolutely not, if we look deeply in spiritual reality. Our karmas decides where any being has to move through either in this

universe or in some other Universe and in which life form. It is difficult to understand in which world we take birth and which world we will move through, reason being Brahm-anda is composed of  so many multiverse universes within each of so Many inter- related
Brahmands

and in each of them, it has Many forms of trinity godheads are also present in each and every Universe. we can't imagine. This can be easily Understandable from Many of verses explained in Bhagwad puraan regarding parallel universe and Multiverse theory based on vedic cosmology

that we will discuss in later part of this article. But First we need to understand how our Brahmand or universe structure is composed of in how many layers of spiritual reality that can give us idea of the how lokas or universes do exists.

Below mentioned verse taken from Bhagwad puraan clearly says on the Divine desire of the krishna or Govinda for manifestation of so many universes as follows:

" Even though over a period of time I might count all the atoms of the universe, I could not count all of My opulences which I manifest within innumerable universes

(Bhagavata Purana 11.16.39 )

Above quotes clearly speaks that the supreme godhead manifest in different universes in many of Infinite forms those are uncountable for lord himself. This shows that the birth of Soul happens in those innumerable time and in so many dimensions in different-different species

and in each of those universe is manifested from him are hard to explain and but we can only understand it by karmic cycles those took in different species.

Few of verse from bhagwad purana explains the theory of multiverse :
" What am I, a small creature measuring seven spans of my own hand? I am enclosed in a pot like universe composed of material nature, the total material energy, false ego, ether, air, water and earth.

And what is Your glory? Unlimited universes pass through the pores of Your body just as particles of dust pass through the openings of a screened window, "
(Bhagavata Purana 10.14.11)

Because You are unlimited, neither the lords of heaven nor even You Yourself can ever reach the end of Your glories. The countless universes, each enveloped in its shell, are compelled by the wheel of time to wander within You, like particles of dust blowing about in the sky.

The śrutis, following their method of eliminating everything separate from the Supreme, become successful by revealing You as their final conclusion, "
(Bhagavata Purana 10.87.41)

The layers or elements covering the universes are each ten times thicker than the one before, and all the universes clustered together appear like atoms in a huge combination, 

(Bhagavata Purana 3.11.41)

Sanskrit quotes from Srimad Bhagwad Puran :

ŚB 10.14.11
क्‍वाहं तमोमहदहंखचराग्निवार्भू-
संवेष्टिताण्डघटसप्तवितस्तिकाय: ।
क्‍वेद‍ृग्विधाविगणिताण्डपराणुचर्या-
वाताध्वरोमविवरस्य च ते महित्वम् ॥ ११ ॥
.

ŚB 11.16.39
सङ्ख्यानं परमाणूनां कालेन क्रियते मया ।
न तथा मे विभूतीनां सृजतोऽण्डानि कोटिश: ॥ ३९ ॥
ŚB 10.87.41
द्युपतय एव ते न ययुरन्तमनन्ततयात्वमपि यदन्तराण्डनिचया ननु सावरणा: । ख इव रजांसि वान्ति वयसा सह यच्छ्रुतय-स्त्वयि हि फलन्त्यतन्निरसनेन भवन्निधना: ॥ ४१ ॥

SB 3.11.41
दशोत्तराधिकैर्यत्र प्रविष्टः परमाणुवत् ।
लक्ष्यतेऽन्तर्गताश्चान्ये कोटिशो ह्यण्डराशयः ॥४१॥
Source and reference: Srimad Bahgwad Puran by Srila prabhupad

Padma puran quote on life form spices:

Jalaja Nava lakshani, Sthavara laksha-vimshati, krimayo rudra-sankhyakah, pakshinam Dasha-lakshanam, trinshal-lakshani pashavah, chatur lakshani manavah.